@@ -6615,6 +6615,23 @@ func TestContext2Apply_unknownAttribute(t *testing.T) {
 	}
 }
 
+func TestContext2Apply_unknownAttributeInterpolate(t *testing.T) {
+	m := testModule(t, "apply-unknown-interpolate")
+	p := testProvider("aws")
+	p.ApplyFn = testApplyFn
+	p.DiffFn = testDiffFn
+	ctx := testContext2(t, &ContextOpts{
+		Module: m,
+		Providers: map[string]ResourceProviderFactory{
+			"aws": testProviderFuncFixed(p),
+		},
+	})
+
+	if _, err := ctx.Plan(); err == nil {
+		t.Fatal("should error")
+	}
+}
+
 func TestContext2Apply_vars(t *testing.T) {
 	m := testModule(t, "apply-vars")
 	p := testProvider("aws")
 
@@ -362,7 +362,7 @@ MISSING:
 	// Validation for missing interpolations should happen at a higher
 	// semantic level. If we reached this point and don't have variables,
 	// just return the computed value.
-	if scope == nil || scope.Resource == nil {
+	if scope == nil && scope.Resource == nil {
 		return config.UnknownVariableValue, nil
 	}
 
 
@@ -0,0 +1 @@
+variable "value" {}
@@ -0,0 +1,6 @@
+resource "aws_instance" "foo" {}
+
+module "child" {
+    source = "./child"
+    value = "${aws_instance.foo.nope}"
+}
Original file line number	Diff line number	Diff line change
`@@ -362,7 +362,7 @@ MISSING:`
`362`	`362`	`// Validation for missing interpolations should happen at a higher`
`363`	`363`	`// semantic level. If we reached this point and don't have variables,`
`364`	`364`	`// just return the computed value.`
`365`		`- if scope == nil \|\| scope.Resource == nil {`
	`365`	`+ if scope == nil && scope.Resource == nil {`
`366`	`366`	`return config.UnknownVariableValue, nil`
`367`	`367`	`}`
`368`	`368`