diff --git a/store.js b/store.js
index ae2955a258..ffef5c7ca8 100644
--- a/store.js
+++ b/store.js
@@ -24,7 +24,7 @@ export function readable(start, value) {
 				if (index !== -1) subscribers.splice(index, 1);
 
 				if (subscribers.length === 0) {
-					stop();
+					stop && stop();
 					stop = null;
 				}
 			};
@@ -85,4 +85,4 @@ export function derive(stores, fn) {
 			run_all(unsubscribers);
 		};
 	});
-}
\ No newline at end of file
+}