fix

Author: xueyizheng

backend/modules/evaluation/domain/service/insight_analysis_impl.go

@@ -157,6 +157,10 @@ func (e ExptInsightAnalysisServiceImpl) GenAnalysisReport(ctx context.Context, s
 	if err != nil {
 		return err
 	}
+	if target.EvalTargetVersion == nil || target.EvalTargetVersion.SourceTargetVersion == "" {
+		logs.CtxWarn(ctx, "Experiment %d has no source target version %s", exptID, expt.TargetVersionID)
+		return errorx.NewByCode(errno.CommonInternalErrorCode, errorx.WithExtraMsg(fmt.Sprintf("Experiment %d has no source target version %s", exptID, expt.TargetVersionID)))
+	}
 	param.EvalTargetVersionID = target.EvalTargetVersion.SourceTargetVersion
 	if err != nil {
 		return err