Fix for multivars when modulestate not created yet

terraform/context.go

@@ -1705,7 +1705,6 @@ func (c *walkContext) computeResourceMultiVariable(
 	}
 
 	// Get the relevant module
-	// TODO: Not use only root module
 	module := c.Context.state.ModuleByPath(c.Path)
 
 	count, err := cr.Count()
@@ -1716,8 +1715,8 @@ func (c *walkContext) computeResourceMultiVariable(
 			err)
 	}
 
-	// If we have no count, return empty
-	if count == 0 {
+	// If we have no module in the state yet or count, return empty
+	if module == nil || count == 0 {
 		return "", nil
 	}
 

terraform/terraform_test.go

@@ -844,6 +844,9 @@ STATE:
 const testTerraformPlanModuleMultiVarStr = `
 DIFF:
 
+CREATE: aws_instance.parent.0
+CREATE: aws_instance.parent.1
+
 module.child:
   CREATE: aws_instance.bar.0
     baz:  "" => "baz"

terraform/test-fixtures/plan-module-multi-var/child/main.tf

@@ -1,3 +1,5 @@
+variable "things" {}
+
 resource "aws_instance" "bar" {
   baz = "baz"
   count = 2

terraform/test-fixtures/plan-module-multi-var/main.tf

@@ -1,4 +1,9 @@
+resource "aws_instance" "parent" {
+  count = 2
+}
+
 module "child" {
-    source = "./child"
+  source = "./child"
+  things = "${join(",", aws_instance.bar.*.private_ip)}"
 }