From a22d91b65bc4172c27013f22a5c376ad2573cff7 Mon Sep 17 00:00:00 2001
From: Daniel Banck <daniel@dbanck.de>
Date: Wed, 20 May 2026 18:33:15 +0200
Subject: [PATCH] terraform: Handle missing source in nodeInstallModule

---
 internal/terraform/node_module_install.go | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/internal/terraform/node_module_install.go b/internal/terraform/node_module_install.go
index 49a390df15..0fd64619e4 100644
--- a/internal/terraform/node_module_install.go
+++ b/internal/terraform/node_module_install.go
@@ -73,6 +73,12 @@ func (n *nodeInstallModule) References() []*addrs.Reference {
 func (n *nodeInstallModule) Execute(ctx EvalContext, walkOp walkOperation) tfdiags.Diagnostics {
 	var diags tfdiags.Diagnostics
 
+	if n.ModuleCall.SourceExpr == nil {
+		// Cannot install a module without a source
+		// Outer diags should already contain a parsing error
+		return diags
+	}
+
 	var version configs.VersionConstraint
 	hasVersion := false
 	if n.ModuleCall.VersionExpr != nil {
@@ -141,6 +147,12 @@ func (n *nodeInstallModule) DynamicExpand(ctx EvalContext) (*Graph, tfdiags.Diag
 	var g Graph
 	var diags tfdiags.Diagnostics
 
+	if n.Config == nil {
+		// Cannot expand without a config. This can happen when something goes wrong
+		// during module installation/Execute() above.
+		return nil, diags
+	}
+
 	expander := ctx.InstanceExpander()
 	_, call := n.Addr.Call()
 	expander.SetModuleSingle(n.Path(), call)