diff --git a/mithril.js b/mithril.js
index e8c32a0e..f8a49367 100644
--- a/mithril.js
+++ b/mithril.js
@@ -699,6 +699,7 @@ var StreamFactory = function(log) {
 		return initDependency(self, [stream], derive, recover)
 	}
 	function combine(fn, streams) {
+		if (streams.length > streams.filter(valid).length) throw new Error("Ensure that each item passed to m.prop.combine/m.prop.merge is a stream")
 		return initDependency(createStream(), streams, function() {
 			var failed = streams.filter(errored)
 			if (failed.length > 0) throw {__error: failed[0]._state.error}
@@ -755,6 +756,7 @@ var StreamFactory = function(log) {
 	function ap(stream) {return combine(function(s1, s2) {return s1()(s2())}, [this, stream])}
 	function valueOf() {return this._state.value}
 	function toJSON() {return this._state.value != null && typeof this._state.value.toJSON === "function" ? this._state.value.toJSON() : this._state.value}
+	function valid(stream) {return stream._state }
 	function active(stream) {return stream._state.state === 1}
 	function changed(stream) {return stream._state.changed}
 	function notEnded(stream) {return stream._state.state !== 2}
diff --git a/mithril.min.js b/mithril.min.js
index b57fced5..bc171f33 100644
--- a/mithril.min.js
+++ b/mithril.min.js
@@ -1,42 +1,42 @@
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