diff --git a/src/repeat.js b/src/repeat.js
index 1a2de28..129e12f 100644
--- a/src/repeat.js
+++ b/src/repeat.js
@@ -120,6 +120,9 @@ export class Repeat {
 
     let items = this.items;
     this.strategy = this.strategyLocator.getStrategy(items);
+    if (!this.strategy) {
+      throw new Error(`Value for '${this.sourceExpression}' is non-repeatable`);
+    }
 
     if (!this.isOneTime && !this._observeInnerCollection()) {
       this._observeCollection();