diff --git a/scripts/tmux_record.sh b/scripts/tmux_record.sh
index 0051153d5..d0ecf64f4 100644
--- a/scripts/tmux_record.sh
+++ b/scripts/tmux_record.sh
@@ -1,5 +1,12 @@
 #!/bin/bash
 
+# Check if there is exactly one active window
+WINDOW_COUNT=$(tmux list-windows | wc -l)
+if [ "$WINDOW_COUNT" -ne 1 ]; then
+    echo "Error: Expected exactly 1 tmux window, found $WINDOW_COUNT windows."
+    exit 1
+fi
+
 # Get tmux window size (width x height)
 TMUX_SIZE=$(tmux display -p '#{window_width}x#{window_height}')