diff --git a/extend/Detection/Wy.php b/extend/Detection/Wy.php
index 0f9b978..0927481 100644
--- a/extend/Detection/Wy.php
+++ b/extend/Detection/Wy.php
@@ -117,26 +117,29 @@ class Wy extends Base
         $oss = new Oss();
 
         $pics = [];
-        $detection_pics = explode(',',$order_detection['detection_pic']);
-        foreach ($detection_pics as $key => $value){
-            // 去除用户签名图片第一个/ oss不识别
-            $value = substr($value, 1, strlen($value) - 1);
+        if (!empty($order_detection['detection_pic'])){
+            $detection_pics = explode(',',$order_detection['detection_pic']);
+            foreach ($detection_pics as $key => $value){
+                // 去除用户签名图片第一个/ oss不识别
+                $value = substr($value, 1, strlen($value) - 1);
 
-            $pic = $oss->getObjectToRAM($value);
-            if (empty($pic)){
-                throw new BusinessException("检测管图片错误");
+                $pic = $oss->getObjectToRAM($value);
+                if (empty($pic)){
+                    throw new BusinessException("检测管图片错误");
+                }
+
+                $pic = base64_encode($pic);
+                if (!$pic) {
+                    throw new BusinessException("检测管图片下载失败");
+                }
+
+                $pics[$key]['pictureNo'] = $key + 1; // 图片序号
+                $pics[$key]['pictureName'] = "检测管图片"; // 图片名称
+                $pics[$key]['pictureInfo'] = $pic; // 对图片进行base64后的编码
             }
-
-            $pic = base64_encode($pic);
-            if (!$pic) {
-                throw new BusinessException("检测管图片下载失败");
-            }
-
-            $pics[$key]['pictureNo'] = $key + 1; // 图片序号
-            $pics[$key]['pictureName'] = "检测管图片"; // 图片名称
-            $pics[$key]['pictureInfo'] = $pic; // 对图片进行base64后的编码
         }
 
+
         // 获取签名
         $sign = $this->getSign();