diff --git a/internal/lsp/source/completion_builtin.go b/internal/lsp/source/completion_builtin.go
index d65eb8f4f4..fb247ab0e0 100644
--- a/internal/lsp/source/completion_builtin.go
+++ b/internal/lsp/source/completion_builtin.go
@@ -59,6 +59,9 @@ func (c *completer) builtinArgType(obj types.Object, call *ast.CallExpr, parentI
 
 	switch obj.Name() {
 	case "append":
+		if parentInf.objType == nil {
+			break
+		}
 		inf.objType = parentInf.objType
 
 		// Check if we are completing the variadic append() param.
diff --git a/internal/lsp/testdata/lsp/primarymod/append/append.go b/internal/lsp/testdata/lsp/primarymod/append/append.go
index 6c6bfb797e..68cae673cb 100644
--- a/internal/lsp/testdata/lsp/primarymod/append/append.go
+++ b/internal/lsp/testdata/lsp/primarymod/append/append.go
@@ -17,3 +17,4 @@ func _() {
 	// Don't add "..." to append() argument.
 	bar(append()) //@snippet("))", appendStrings, "aStrings", "aStrings")
 }
+}
diff --git a/internal/lsp/testdata/lsp/primarymod/append/append2.go.in b/internal/lsp/testdata/lsp/primarymod/append/append2.go.in
new file mode 100644
index 0000000000..15bd357b2d
--- /dev/null
+++ b/internal/lsp/testdata/lsp/primarymod/append/append2.go.in
@@ -0,0 +1,5 @@
+package append
+
+func _() {
+	_ = append(a, struct) //@complete(")")
+}
\ No newline at end of file
diff --git a/internal/lsp/testdata/lsp/summary.txt.golden b/internal/lsp/testdata/lsp/summary.txt.golden
index bea9c712e2..bd3db88221 100644
--- a/internal/lsp/testdata/lsp/summary.txt.golden
+++ b/internal/lsp/testdata/lsp/summary.txt.golden
@@ -1,6 +1,6 @@
 -- summary --
 CodeLensCount = 2
-CompletionsCount = 237
+CompletionsCount = 238
 CompletionSnippetCount = 75
 UnimportedCompletionsCount = 11
 DeepCompletionsCount = 5