This should fix #500.

gyunaev · Sep 19, 2022 · a3c2b5a · a3c2b5a
1 parent 0d1f5de
commit a3c2b5a
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/src/windowtools_x11.cpp b/src/windowtools_x11.cpp
@@ -192,6 +192,9 @@ static Window findWindow(Display *display, Window window, bool checkNormality, c
     Window *children;
     unsigned int num_child;
 
+    if ( window == 0 )
+	    return None;
+
     if (XQueryTree(display, window, &root, &parent, &children, &num_child) != 0) {
         for (unsigned int i = 0; i < num_child; i++) {
             if (analyzeWindow(display, children[i], ename) && !dockedWindows.contains(children[i])