diff --git a/src/dom/DomUtil.js b/src/dom/DomUtil.js
index 873b9557..2f3c85a9 100644
--- a/src/dom/DomUtil.js
+++ b/src/dom/DomUtil.js
@@ -85,8 +85,10 @@ L.DomUtil = {
 	},
 
 	enableTextSelection: function () {
-		document.onselectstart = this._onselectstart;
-		this._onselectstart = null;
+		if (this._onselectstart) {
+			document.onselectstart = this._onselectstart;
+			this._onselectstart = null;
+		}
 	},
 
 	hasClass: function (el, name) {