diff --git a/src/groupchat.c b/src/groupchat.c
index 1e782a9..fe23739 100644
--- a/src/groupchat.c
+++ b/src/groupchat.c
@@ -783,7 +783,9 @@ static void groupchat_onDraw(ToxWindow *self, Tox *m)
         mvwvline(ctx->sidebar, 0, 0, ACS_VLINE, y2 - CHATBOX_HEIGHT);
         mvwaddch(ctx->sidebar, y2 - CHATBOX_HEIGHT, 0, ACS_BTEE);
 
+        pthread_mutex_lock(&Winthread.lock);
         int num_peers = groupchats[self->num].num_peers;
+        pthread_mutex_unlock(&Winthread.lock);
 
         wmove(ctx->sidebar, 0, 1);
         wattron(ctx->sidebar, A_BOLD);
@@ -803,11 +805,16 @@ static void groupchat_onDraw(ToxWindow *self, Tox *m)
             /* truncate nick to fit in side panel without modifying list */
             char tmpnck[TOX_MAX_NAME_LENGTH];
             int maxlen = SIDEBAR_WIDTH - 2;
+            pthread_mutex_lock(&Winthread.lock);
             memcpy(tmpnck, &groupchats[self->num].peer_names[peer * TOX_MAX_NAME_LENGTH], maxlen);
+            pthread_mutex_unlock(&Winthread.lock);
             tmpnck[maxlen] = '\0';
 
             /* TODO: Make this not poll */
+            pthread_mutex_lock(&Winthread.lock);
             uint8_t status = tox_group_get_status(m, self->num, i);
+            pthread_mutex_unlock(&Winthread.lock);
+
             int colour = WHITE;
 
             if (status == TOX_GS_AWAY)