4 files changed, 14 insertions, 5 deletions
diff --git a/internal/generate/typesgo.go b/internal/generate/typesgo.go
index ee24845..06ed49a 100644
--- a/internal/generate/typesgo.go
+++ b/internal/generate/typesgo.go
@@ -186,7 +186,7 @@ func writeTraceIdStringMethod(b *strings.Builder) {
 	b.WriteString(`func (s TraceId) String() string {
 	str, ok := traceId2String[s]
 	if !ok {
-		panic(fmt.Sprintf("no string representation for trace ID %d found", s))
+		return fmt.Sprintf("unknown_trace_id_%d", s)
 	}
 	return str
 }
@@ -198,7 +198,7 @@ func writeTraceIdNameMethod(b *strings.Builder) {
 	b.WriteString(`func (s TraceId) Name() string {
 	str, ok := traceId2Name[s]
 	if !ok {
-		panic(fmt.Sprintf("no name for trace ID %d found", s))
+		return fmt.Sprintf("unknown_trace_id_%d", s)
 	}
 	return str
 }
diff --git a/internal/generate/typesgo_test.go b/internal/generate/typesgo_test.go
index 89dafa8..f600582 100644
--- a/internal/generate/typesgo_test.go
+++ b/internal/generate/typesgo_test.go
@@ -240,7 +240,7 @@ func TestGenerateTypesGoTraceIdMethods(t *testing.T) {
 
 	requireContains(t, output, "func (s TraceId) String() string")
 	requireContains(t, output, "func (s TraceId) Name() string")
-	requireContains(t, output, `panic(fmt.Sprintf("no string representation for trace ID %d found", s))`)
+	requireContains(t, output, `return fmt.Sprintf("unknown_trace_id_%d", s)`)
 }
 
 func TestGenerateTypesGoPackageDecl(t *testing.T) {
diff --git a/internal/types/generated_types.go b/internal/types/generated_types.go
index 9cdcc5b..1f4b9d8 100644
--- a/internal/types/generated_types.go
+++ b/internal/types/generated_types.go
@@ -22,7 +22,7 @@ var traceId2Name = map[TraceId]string{
 func (s TraceId) String() string {
 	str, ok := traceId2String[s]
 	if !ok {
-		panic(fmt.Sprintf("no string representation for trace ID %d found", s))
+		return fmt.Sprintf("unknown_trace_id_%d", s)
 	}
 	return str
 }
@@ -30,7 +30,7 @@ func (s TraceId) String() string {
 func (s TraceId) Name() string {
 	str, ok := traceId2Name[s]
 	if !ok {
-		panic(fmt.Sprintf("no name for trace ID %d found", s))
+		return fmt.Sprintf("unknown_trace_id_%d", s)
 	}
 	return str
 }
diff --git a/internal/types/types_test.go b/internal/types/types_test.go
index 6abebdb..8ba7367 100644
--- a/internal/types/types_test.go
+++ b/internal/types/types_test.go
@@ -1,6 +1,7 @@
 package types
 
 import (
+	"fmt"
 	"syscall"
 	"testing"
 )
@@ -156,6 +157,14 @@ func TestEqualsDifferentValues(t *testing.T) {
 	t.Log("Equals returns false for same type but different values")
 }
 
+func TestTraceIdUnknownFallback(t *testing.T) {
+	unknown := TraceId(0xFFFFFFFF)
+	want := fmt.Sprintf("unknown_trace_id_%d", unknown)
+
+	assertEquals(t, want, unknown.String())
+	assertEquals(t, want, unknown.Name())
+}
+
 func assertEquals[T comparable](t *testing.T, a, b T) {
 	if a != b {
 		t.Errorf("Expected %v, got %v", a, b)