1 files changed, 3 insertions, 0 deletions
diff --git a/src/core.js b/src/core.js
index 0b99b74a2..85a381661 100644
--- a/src/core.js
+++ b/src/core.js
@@ -679,6 +679,9 @@ jQuery.extend({
 	},
 
 	inArray: function( elem, array ) {
+		if ( !array ) {
+			return -1;
+		}
 
 		if ( indexOf ) {
 			return indexOf.call( array, elem );