diff --git a/cmd/guru/describe.go b/cmd/guru/describe.go
index f903f166..caf46164 100644
--- a/cmd/guru/describe.go
+++ b/cmd/guru/describe.go
@@ -324,6 +324,9 @@ func describeValue(qpos *queryPos, path []ast.Node) (*describeValueResult, error
 	}
 
 	t := qpos.info.TypeOf(expr)
+	if t == nil {
+		t = types.Typ[types.Invalid]
+	}
 	constVal := qpos.info.Types[expr].Value
 
 	return &describeValueResult{
diff --git a/cmd/guru/testdata/src/describe/main.go b/cmd/guru/testdata/src/describe/main.go
index 4677d80b..d519db17 100644
--- a/cmd/guru/testdata/src/describe/main.go
+++ b/cmd/guru/testdata/src/describe/main.go
@@ -86,6 +86,8 @@ func main() { // @describe func-def-main "main"
 	var _ int // @describe var-def-blank "_"
 
 	var _ lib.Outer // @describe lib-outer "Outer"
+
+	unknown() // @describe call-unknown "\\("
 }
 
 type I interface { // @describe def-iface-I "I"
diff --git a/cmd/guru/testdata/src/describe/main.golden b/cmd/guru/testdata/src/describe/main.golden
index 925c980e..f7ffdcbb 100644
--- a/cmd/guru/testdata/src/describe/main.golden
+++ b/cmd/guru/testdata/src/describe/main.golden
@@ -197,6 +197,9 @@ Fields:
 	inner.C           bool
 	inner.recursive.E bool
 
+-------- @describe call-unknown --------
+function call (or conversion) of type invalid type
+
 -------- @describe def-iface-I --------
 definition of type I (size 16, align 8)
 Method set: