diff --git a/src/chat.c b/src/chat.c
index c165f84..ff9137d 100644
--- a/src/chat.c
+++ b/src/chat.c
@@ -296,7 +296,9 @@ static void chat_onFileData(ToxWindow *self, Tox *m, int num, uint8_t filenum, u
         wattron(ctx->history, COLOR_PAIR(RED));
         wprintw(ctx->history, "* Error writing to file.\n");
         wattroff(ctx->history, COLOR_PAIR(RED));
+
         tox_file_send_control(m, num, 1, filenum, TOX_FILECONTROL_KILL, 0, 0);
+        chat_close_file_receiver(num, filenum);
     }
 }
 
diff --git a/src/chat_commands.c b/src/chat_commands.c
index f69e081..cd37086 100644
--- a/src/chat_commands.c
+++ b/src/chat_commands.c
@@ -90,7 +90,7 @@ void cmd_groupinvite(WINDOW *window, ToxWindow *self, Tox *m, int argc, char (*a
 
 void cmd_join_group(WINDOW *window, ToxWindow *self, Tox *m, int argc, char (*argv)[MAX_STR_SIZE])
 {
-    if (num_active_windows() >= MAX_WINDOWS_NUM) {
+    if (get_num_active_windows() >= MAX_WINDOWS_NUM) {
         wattron(window, COLOR_PAIR(RED));
         wprintw(window, " * Warning: Too many windows are open.\n");
         wattron(window, COLOR_PAIR(RED));
diff --git a/src/friendlist.c b/src/friendlist.c
index 13059be..b220a93 100644
--- a/src/friendlist.c
+++ b/src/friendlist.c
@@ -77,7 +77,7 @@ static void friendlist_onMessage(ToxWindow *self, Tox *m, int num, uint8_t *str,
         return;
 
     if (friends[num].chatwin == -1) {
-        if (num_active_windows() < MAX_WINDOWS_NUM) {
+        if (get_num_active_windows() < MAX_WINDOWS_NUM) {
             friends[num].chatwin = add_window(m, new_chat(m, friends[num].num));
         } else {
             uint8_t nick[TOX_MAX_NAME_LENGTH] = {'\0'};
@@ -178,7 +178,7 @@ static void friendlist_onFileSendRequest(ToxWindow *self, Tox *m, int num, uint8
         return;
 
     if (friends[num].chatwin == -1) {
-        if (num_active_windows() < MAX_WINDOWS_NUM) {
+        if (get_num_active_windows() < MAX_WINDOWS_NUM) {
             friends[num].chatwin = add_window(m, new_chat(m, friends[num].num));
         } else {
             tox_file_send_control(m, num, 1, filenum, TOX_FILECONTROL_KILL, 0, 0);
@@ -203,7 +203,7 @@ static void friendlist_onGroupInvite(ToxWindow *self, Tox *m, int num, uint8_t *
         return;
 
     if (friends[num].chatwin == -1) {
-        if (num_active_windows() < MAX_WINDOWS_NUM) {
+        if (get_num_active_windows() < MAX_WINDOWS_NUM) {
             friends[num].chatwin = add_window(m, new_chat(m, friends[num].num));
         } else {
             uint8_t nick[TOX_MAX_NAME_LENGTH] = {'\0'};
@@ -264,7 +264,7 @@ static void friendlist_onKey(ToxWindow *self, Tox *m, wint_t key)
         /* Jump to chat window if already open */
         if (friends[f].chatwin != -1) {
             set_active_window(friends[f].chatwin);
-        } else if (num_active_windows() < MAX_WINDOWS_NUM) {
+        } else if (get_num_active_windows() < MAX_WINDOWS_NUM) {
             friends[f].chatwin = add_window(m, new_chat(m, friends[f].num));
             set_active_window(friends[f].chatwin);
         } else {
diff --git a/src/global_commands.c b/src/global_commands.c
index 80a2978..1babf81 100644
--- a/src/global_commands.c
+++ b/src/global_commands.c
@@ -197,7 +197,7 @@ void cmd_connect(WINDOW *window, ToxWindow *self, Tox *m, int argc, char (*argv)
 
 void cmd_groupchat(WINDOW *window, ToxWindow *self, Tox *m, int argc, char (*argv)[MAX_STR_SIZE])
 {
-    if (num_active_windows() >= MAX_WINDOWS_NUM) {
+    if (get_num_active_windows() >= MAX_WINDOWS_NUM) {
         wattron(window, COLOR_PAIR(RED));
         wprintw(window, " * Warning: Too many windows are open.\n");
         wattron(window, COLOR_PAIR(RED));
diff --git a/src/toxic_windows.h b/src/toxic_windows.h
index 1e10a7b..ee2e9f3 100644
--- a/src/toxic_windows.h
+++ b/src/toxic_windows.h
@@ -234,7 +234,7 @@ void draw_active_window(Tox *m);
 int add_window(Tox *m, ToxWindow w);
 void del_window(ToxWindow *w);
 void set_active_window(int ch);
-int num_active_windows(void);
+int get_num_active_windows(void);
 
 /* cleans up all chat and groupchat windows (should only be called on shutdown) */
 void kill_all_windows(void);
diff --git a/src/windows.c b/src/windows.c
index e5dd40f..ff6202c 100644
--- a/src/windows.c
+++ b/src/windows.c
@@ -39,12 +39,14 @@ static ToxWindow *active_window;
 
 extern ToxWindow *prompt;
 
+static int num_active_windows;
+
 /* CALLBACKS START */
 void on_request(uint8_t *public_key, uint8_t *data, uint16_t length, void *userdata)
 {
     int i;
     
-    for (i = 0; i < MAX_WINDOWS_NUM; ++i) {
+    for (i = 0; i < num_active_windows; ++i) {
         if (windows[i].onFriendRequest != NULL)
             windows[i].onFriendRequest(&windows[i], public_key, data, length);
     }
@@ -54,7 +56,7 @@ void on_connectionchange(Tox *m, int friendnumber, uint8_t status, void *userdat
 {
     int i;
 
-    for (i = 0; i < MAX_WINDOWS_NUM; ++i) {
+    for (i = 0; i < num_active_windows; ++i) {
         if (windows[i].onConnectionChange != NULL)
             windows[i].onConnectionChange(&windows[i], m, friendnumber, status);
     }
@@ -64,7 +66,7 @@ void on_typing_change(Tox *m, int friendnumber, int is_typing, void *userdata)
 {
     int i;
 
-    for (i = 0; i < MAX_WINDOWS_NUM; ++i) {
+    for (i = 0; i < num_active_windows; ++i) {
         if (windows[i].onTypingChange != NULL)
             windows[i].onTypingChange(&windows[i], m, friendnumber, is_typing);
     }
@@ -74,7 +76,7 @@ void on_message(Tox *m, int friendnumber, uint8_t *string, uint16_t length, void
 {
     int i;
 
-    for (i = 0; i < MAX_WINDOWS_NUM; ++i) {
+    for (i = 0; i < num_active_windows; ++i) {
         if (windows[i].onMessage != NULL)
             windows[i].onMessage(&windows[i], m, friendnumber, string, length);
     }
@@ -84,7 +86,7 @@ void on_action(Tox *m, int friendnumber, uint8_t *string, uint16_t length, void
 {
     int i;
 
-    for (i = 0; i < MAX_WINDOWS_NUM; ++i) {
+    for (i = 0; i < num_active_windows; ++i) {
         if (windows[i].onAction != NULL)
             windows[i].onAction(&windows[i], m, friendnumber, string, length);
     }
@@ -97,7 +99,7 @@ void on_nickchange(Tox *m, int friendnumber, uint8_t *string, uint16_t length, v
 
     int i;
 
-    for (i = 0; i < MAX_WINDOWS_NUM; ++i) {
+    for (i = 0; i < num_active_windows; ++i) {
         if (windows[i].onNickChange != NULL)
             windows[i].onNickChange(&windows[i], m, friendnumber, string, length);
     }
@@ -110,7 +112,7 @@ void on_statusmessagechange(Tox *m, int friendnumber, uint8_t *string, uint16_t
 {
     int i;
 
-    for (i = 0; i < MAX_WINDOWS_NUM; ++i) {
+    for (i = 0; i < num_active_windows; ++i) {
         if (windows[i].onStatusMessageChange != NULL)
             windows[i].onStatusMessageChange(&windows[i], friendnumber, string, length);
     }
@@ -120,7 +122,7 @@ void on_statuschange(Tox *m, int friendnumber, TOX_USERSTATUS status, void *user
 {
     int i;
 
-    for (i = 0; i < MAX_WINDOWS_NUM; ++i) {
+    for (i = 0; i < num_active_windows; ++i) {
         if (windows[i].onStatusChange != NULL)
             windows[i].onStatusChange(&windows[i], m, friendnumber, status);
     }
@@ -130,7 +132,7 @@ void on_friendadded(Tox *m, int friendnumber, bool sort)
 {
     int i;
 
-    for (i = 0; i < MAX_WINDOWS_NUM; ++i) {
+    for (i = 0; i < num_active_windows; ++i) {
         if (windows[i].onFriendAdded != NULL)
             windows[i].onFriendAdded(&windows[i], m, friendnumber, sort);
     }
@@ -144,7 +146,7 @@ void on_groupmessage(Tox *m, int groupnumber, int peernumber, uint8_t *message,
 {
     int i;
 
-    for (i = 0; i < MAX_WINDOWS_NUM; ++i) {
+    for (i = 0; i < num_active_windows; ++i) {
         if (windows[i].onGroupMessage != NULL)
             windows[i].onGroupMessage(&windows[i], m, groupnumber, peernumber, message, length);
     }
@@ -155,7 +157,7 @@ void on_groupaction(Tox *m, int groupnumber, int peernumber, uint8_t *action, ui
 {
     int i;
 
-    for (i = 0; i < MAX_WINDOWS_NUM; ++i) {
+    for (i = 0; i < num_active_windows; ++i) {
         if (windows[i].onGroupAction != NULL)
             windows[i].onGroupAction(&windows[i], m, groupnumber, peernumber, action, length);
     }
@@ -165,7 +167,7 @@ void on_groupinvite(Tox *m, int friendnumber, uint8_t *group_pub_key, void *user
 {
     int i;
 
-    for (i = 0; i < MAX_WINDOWS_NUM; ++i) {
+    for (i = 0; i < num_active_windows; ++i) {
         if (windows[i].onGroupInvite != NULL)
             windows[i].onGroupInvite(&windows[i], m, friendnumber, group_pub_key);
     }
@@ -175,7 +177,7 @@ void on_group_namelistchange(Tox *m, int groupnumber, int peernumber, uint8_t ch
 {
     int i;
 
-    for (i = 0; i < MAX_WINDOWS_NUM; ++i) {
+    for (i = 0; i < num_active_windows; ++i) {
         if (windows[i].onGroupNamelistChange != NULL)
             windows[i].onGroupNamelistChange(&windows[i], m, groupnumber, peernumber, change);
     }
@@ -186,7 +188,7 @@ void on_file_sendrequest(Tox *m, int friendnumber, uint8_t filenumber, uint64_t
 {
     int i;
 
-    for (i = 0; i < MAX_WINDOWS_NUM; ++i) {
+    for (i = 0; i < num_active_windows; ++i) {
         if (windows[i].onFileSendRequest != NULL)
             windows[i].onFileSendRequest(&windows[i], m, friendnumber, filenumber, filesize,
                                          filename, filename_length);
@@ -198,7 +200,7 @@ void on_file_control (Tox *m, int friendnumber, uint8_t receive_send, uint8_t fi
 {
     int i;
 
-    for (i = 0; i < MAX_WINDOWS_NUM; ++i) {
+    for (i = 0; i < num_active_windows; ++i) {
         if (windows[i].onFileControl != NULL)
             windows[i].onFileControl(&windows[i], m, friendnumber, receive_send, filenumber,
                                      control_type, data, length);
@@ -210,7 +212,7 @@ void on_file_data(Tox *m, int friendnumber, uint8_t filenumber, uint8_t *data, u
 {
     int i;
 
-    for (i = 0; i < MAX_WINDOWS_NUM; ++i) {
+    for (i = 0; i < num_active_windows; ++i) {
         if (windows[i].onFileData != NULL)
             windows[i].onFileData(&windows[i], m, friendnumber, filenumber, data, length);
     }
@@ -240,6 +242,8 @@ int add_window(Tox *m, ToxWindow w)
         windows[i] = w;
         w.onInit(&w, m);
 
+        ++num_active_windows;
+
         return i;
     }
 
@@ -256,6 +260,7 @@ void del_window(ToxWindow *w)
 
     clear();
     refresh();
+    --num_active_windows;
 }
 
 /* Shows next window when tab or back-tab is pressed */
@@ -398,17 +403,9 @@ void draw_active_window(Tox *m)
         a->onKey(a, m, ch);
 }
 
-int num_active_windows(void)
+int get_num_active_windows(void)
 {
-    int count = 0;
-    int i;
-
-    for (i = 0; i < MAX_WINDOWS_NUM; ++i) {
-        if (windows[i].active)
-            ++count;
-    }
-
-    return count;
+    return num_active_windows;
 }
 
 /* destroys all chat and groupchat windows (should only be called on shutdown) */