2 files changed, 2 insertions, 2 deletions
diff --git a/source/pdf/js/util.js b/source/pdf/js/util.js
index c634f781..ce60ec43 100644
--- a/source/pdf/js/util.js
+++ b/source/pdf/js/util.js
@@ -860,7 +860,7 @@ function AFPercent_Keystroke(nDec, sepStyle) {
 
 function AFPercent_Format(nDec, sepStyle) {
 	var val = AFMakeNumber(event.value);
-	if (!val) {
+	if (val == null) {
 		event.value = '';
 		return;
 	}
diff --git a/source/pdf/js/util.js.h b/source/pdf/js/util.js.h
index a4e5124f..9d356c1a 100644
--- a/source/pdf/js/util.js.h
+++ b/source/pdf/js/util.js.h
@@ -860,7 +860,7 @@
 "\n"
 "function AFPercent_Format(nDec, sepStyle) {\n"
 "var val = AFMakeNumber(event.value);\n"
-"if (!val) {\n"
+"if (val == null) {\n"
 "event.value = '';\n"
 "return;\n"
 "}\n"