diff --git a/codegen/codegen.go b/codegen/codegen.go
index 25989b8d3f7..df5d6e21a9e 100644
--- a/codegen/codegen.go
+++ b/codegen/codegen.go
@@ -50,6 +50,18 @@ func (tm TypeMap) Get(typeName string) *TypeMapEntry {
 	return nil
 }
 
+func (tm TypeMap) Check() error {
+	for idx, entry := range tm {
+		if entry.TypeName == "" {
+			return fmt.Errorf("entity #%d: typeName is not defined", idx+1)
+		}
+		if entry.EntityPath == "" {
+			return fmt.Errorf("entity #%d: entityPath is not defined", idx+1)
+		}
+	}
+	return nil
+}
+
 type TypeMapEntry struct {
 	TypeName   string `yaml:"typeName"`
 	EntityPath string `yaml:"entityPath"`
diff --git a/main.go b/main.go
index 44cd3a08887..f4d49055ee7 100644
--- a/main.go
+++ b/main.go
@@ -40,6 +40,11 @@ func main() {
 	}
 
 	types := loadTypeMap()
+	err = types.Check()
+	if err != nil {
+		fmt.Fprintln(os.Stderr, "invalid typemap format: "+err.Error())
+		os.Exit(1)
+	}
 
 	err = codegen.Generate(codegen.Config{
 		ModelFilename:    *models,