diff --git a/relay/compatible_handler.go b/relay/compatible_handler.go
index 01ab1fff4..c2d6b6fa1 100644
--- a/relay/compatible_handler.go
+++ b/relay/compatible_handler.go
@@ -90,41 +90,43 @@ func TextHelper(c *gin.Context, info *relaycommon.RelayInfo) (newAPIError *types
 
 		if info.ChannelSetting.SystemPrompt != "" {
 			// 如果有系统提示，则将其添加到请求中
-			request := convertedRequest.(*dto.GeneralOpenAIRequest)
-			containSystemPrompt := false
-			for _, message := range request.Messages {
-				if message.Role == request.GetSystemRoleName() {
-					containSystemPrompt = true
-					break
-				}
-			}
-			if !containSystemPrompt {
-				// 如果没有系统提示，则添加系统提示
-				systemMessage := dto.Message{
-					Role:    request.GetSystemRoleName(),
-					Content: info.ChannelSetting.SystemPrompt,
-				}
-				request.Messages = append([]dto.Message{systemMessage}, request.Messages...)
-			} else if info.ChannelSetting.SystemPromptOverride {
-				common.SetContextKey(c, constant.ContextKeySystemPromptOverride, true)
-				// 如果有系统提示，且允许覆盖，则拼接到前面
-				for i, message := range request.Messages {
+			request, ok := convertedRequest.(*dto.GeneralOpenAIRequest)
+			if ok {
+				containSystemPrompt := false
+				for _, message := range request.Messages {
 					if message.Role == request.GetSystemRoleName() {
-						if message.IsStringContent() {
-							request.Messages[i].SetStringContent(info.ChannelSetting.SystemPrompt + "\n" + message.StringContent())
-						} else {
-							contents := message.ParseContent()
-							contents = append([]dto.MediaContent{
-								{
-									Type: dto.ContentTypeText,
-									Text: info.ChannelSetting.SystemPrompt,
-								},
-							}, contents...)
-							request.Messages[i].Content = contents
-						}
+						containSystemPrompt = true
 						break
 					}
 				}
+				if !containSystemPrompt {
+					// 如果没有系统提示，则添加系统提示
+					systemMessage := dto.Message{
+						Role:    request.GetSystemRoleName(),
+						Content: info.ChannelSetting.SystemPrompt,
+					}
+					request.Messages = append([]dto.Message{systemMessage}, request.Messages...)
+				} else if info.ChannelSetting.SystemPromptOverride {
+					common.SetContextKey(c, constant.ContextKeySystemPromptOverride, true)
+					// 如果有系统提示，且允许覆盖，则拼接到前面
+					for i, message := range request.Messages {
+						if message.Role == request.GetSystemRoleName() {
+							if message.IsStringContent() {
+								request.Messages[i].SetStringContent(info.ChannelSetting.SystemPrompt + "\n" + message.StringContent())
+							} else {
+								contents := message.ParseContent()
+								contents = append([]dto.MediaContent{
+									{
+										Type: dto.ContentTypeText,
+										Text: info.ChannelSetting.SystemPrompt,
+									},
+								}, contents...)
+								request.Messages[i].Content = contents
+							}
+							break
+						}
+					}
+				}
 			}
 		}