fix: possible nil deref in admin_info

Author: wooffie

api/admin_info.go

@@ -1121,14 +1121,15 @@ LabelsWaitLoop:
 				if inStep != nil && *inStep > 0 {
 					step = *inStep
 				}
+				
+				if inStart != nil && inEnd != nil {
+					extraParamters = fmt.Sprintf("&start=%d&end=%d", *inStart, *inEnd)
+				}
+				
 				if step > 0 {
 					extraParamters = fmt.Sprintf("%s&step=%d", extraParamters, step)
 				}
 
-				if inStart != nil && inEnd != nil {
-					extraParamters = fmt.Sprintf("&start=%d&end=%d&step=%d", *inStart, *inEnd, *inStep)
-				}
-
 				// replace the `$__rate_interval` global for step with unit (s for seconds)
 				queryExpr := strings.ReplaceAll(target.Expr, "$__rate_interval", fmt.Sprintf("%ds", 240))
 				if strings.Contains(queryExpr, "$") {