diff --git a/PowerEditor/src/Notepad_plus.cpp b/PowerEditor/src/Notepad_plus.cpp
index 373a7728a..e324d562e 100644
--- a/PowerEditor/src/Notepad_plus.cpp
+++ b/PowerEditor/src/Notepad_plus.cpp
@@ -5840,6 +5840,9 @@ void Notepad_plus::drawTabbarColoursFromStylerArray()
 
 void Notepad_plus::drawAutocompleteColoursFromTheme(COLORREF fgColor, COLORREF bgColor)
 {
+	if (bgColor == 0xFFFFFF)
+		return;
+
 	int rbv = GetRValue(bgColor);
 	int gbv = GetGValue(bgColor);
 	int bbv = GetBValue(bgColor);