diff --git a/command/jsonconfig/config.go b/command/jsonconfig/config.go
index ecfa12c5e9..0b27c7af4b 100644
--- a/command/jsonconfig/config.go
+++ b/command/jsonconfig/config.go
@@ -238,6 +238,11 @@ func marshalModuleCalls(c *configs.Config, schemas *terraform.Schemas) map[strin
 }
 
 func marshalModuleCall(c *configs.Config, mc *configs.ModuleCall, schemas *terraform.Schemas) moduleCall {
+	// It is possible to have a module call with a nil config.
+	if c == nil {
+		return moduleCall{}
+	}
+
 	ret := moduleCall{
 		Source:            mc.SourceAddr,
 		VersionConstraint: mc.Version.Required.String(),
diff --git a/command/test-fixtures/show-json/nested-modules/main.tf b/command/test-fixtures/show-json/nested-modules/main.tf
new file mode 100644
index 0000000000..ef0bad2bbc
--- /dev/null
+++ b/command/test-fixtures/show-json/nested-modules/main.tf
@@ -0,0 +1,3 @@
+module "my_module" {
+  source = "./modules"
+}
diff --git a/command/test-fixtures/show-json/nested-modules/modules/main.tf b/command/test-fixtures/show-json/nested-modules/modules/main.tf
new file mode 100644
index 0000000000..990155ecb3
--- /dev/null
+++ b/command/test-fixtures/show-json/nested-modules/modules/main.tf
@@ -0,0 +1,3 @@
+module "more" {
+  source = "./more-modules"
+}
diff --git a/command/test-fixtures/show-json/nested-modules/modules/more-modules/main.tf b/command/test-fixtures/show-json/nested-modules/modules/more-modules/main.tf
new file mode 100644
index 0000000000..488a271930
--- /dev/null
+++ b/command/test-fixtures/show-json/nested-modules/modules/more-modules/main.tf
@@ -0,0 +1,4 @@
+variable "misspelled" {
+  default     = "ehllo"
+  descriptoni = "I am a misspelled attribute"
+}
diff --git a/command/test-fixtures/show-json/nested-modules/output.json b/command/test-fixtures/show-json/nested-modules/output.json
new file mode 100644
index 0000000000..75f15466e7
--- /dev/null
+++ b/command/test-fixtures/show-json/nested-modules/output.json
@@ -0,0 +1,23 @@
+{
+    "format_version": "0.1",
+    "terraform_version": "0.12.1-dev",
+    "planned_values": {
+        "root_module": {}
+    },
+    "configuration": {
+        "root_module": {
+            "module_calls": {
+                "my_module": {
+                    "source": "./modules",
+                    "module": {
+                        "module_calls": {
+                            "more": {
+                                "module": {}
+                            }
+                        }
+                    }
+                }
+            }
+        }
+    }
+}
\ No newline at end of file