diff --git a/openapi/generate.go b/openapi/generate.go
index c6011b5..a456350 100644
--- a/openapi/generate.go
+++ b/openapi/generate.go
@@ -169,29 +169,31 @@ func (g *Generate) AddApiDoc(docFlag string, apiMeta define.UriConfig, request a
 	apiOperate, isRead := g.initApiConfig(docFlag, apiMeta)
 	//requestTypeStr := requestType.String()
 	if isRead {
-		for paramName, paramConfig := range schemaData.Value.Properties {
-			apiOperate.Parameters = append(apiOperate.Parameters, &openapi3.ParameterRef{
-				Extensions: nil,
-				Origin:     nil,
-				Ref:        "",
-				Value: &openapi3.Parameter{
-					Extensions:      nil,
-					Origin:          nil,
-					Name:            paramName,
-					In:              strings.ToLower(consts.RequestDataLocationQuery.String()),
-					Description:     paramConfig.Value.Description,
-					Style:           "",
-					Explode:         nil,
-					AllowEmptyValue: paramConfig.Value.AllowEmptyValue,
-					AllowReserved:   false,
-					Deprecated:      false,
-					Required:        op_array.ArrayType(paramConfig.Value.Required).Has(paramName) >= 0,
-					Schema:          paramConfig,
-					Example:         nil,
-					Examples:        nil,
-					Content:         nil,
-				},
-			})
+		if nil != schemaData {
+			for paramName, paramConfig := range schemaData.Value.Properties {
+				apiOperate.Parameters = append(apiOperate.Parameters, &openapi3.ParameterRef{
+					Extensions: nil,
+					Origin:     nil,
+					Ref:        "",
+					Value: &openapi3.Parameter{
+						Extensions:      nil,
+						Origin:          nil,
+						Name:            paramName,
+						In:              strings.ToLower(consts.RequestDataLocationQuery.String()),
+						Description:     paramConfig.Value.Description,
+						Style:           "",
+						Explode:         nil,
+						AllowEmptyValue: paramConfig.Value.AllowEmptyValue,
+						AllowReserved:   false,
+						Deprecated:      false,
+						Required:        op_array.ArrayType(paramConfig.Value.Required).Has(paramName) >= 0,
+						Schema:          paramConfig,
+						Example:         nil,
+						Examples:        nil,
+						Content:         nil,
+					},
+				})
+			}
 		}
 	} else {
 		apiOperate.RequestBody = &openapi3.RequestBodyRef{