diff --git a/Backlight/AAABacklight.m b/Backlight/AAABacklight.m
index 181da90..cd37ae4 100755
--- a/Backlight/AAABacklight.m
+++ b/Backlight/AAABacklight.m
@@ -307,7 +307,8 @@ - (void)colorPanelWillClose:(NSNotification *)notification
 - (void)updateBacklightViewWithTextView:(NSTextView *)textView
 {
     // Before changing the textView's instance, remove the old one's highlight.
-    if (self.textView != textView &&
+    if (self.textView != nil &&
+        self.textView != textView &&
         self.currentMode == AAABacklightModeUnderneath &&
         [self.textView.layoutManager temporaryAttribute:NSBackgroundColorAttributeName
                                        atCharacterIndex:self.currentLineRange.location