diff --git a/public_html/doc/customer_detail.php b/public_html/doc/customer_detail.php
index 427a178..72df484 100644
--- a/public_html/doc/customer_detail.php
+++ b/public_html/doc/customer_detail.php
@@ -2298,7 +2298,7 @@ $(document).ready(function(){
               <td class="td-text-info">
                 <div class="number-input">
                   <button class="left" type="button">▼</button>
-                    <input type="number" class="d_sludge" id="d_sludge" name="d_sludge" value="<?= isset($d_sludge) && $d_sludge !== '' ? $d_sludge : $c_sludge ?>" min="0" max="100" placeholder="50">
+                    <input type="number" class="d_sludge" id="d_sludge" name="d_sludge" value="<?= (isset($d_sludge) && trim((string)$d_sludge) !== '') ? $d_sludge : $c_sludge ?>" min="0" max="100" placeholder="50">
                   <button class="right" type="button">▲</button>
                 </div>
                 
diff --git a/public_html/lib/order_lib.php b/public_html/lib/order_lib.php
index b2708c1..329e3c5 100644
--- a/public_html/lib/order_lib.php
+++ b/public_html/lib/order_lib.php
@@ -89,7 +89,7 @@ if ($_SESSION['ss_LEVEL'] == 9) $add_qry = " AND m_uid = '".$_SESSION['ss_UID'].
 else $add_qry = "";
 
 // Get Sludge Info
-$qry_sludge = "SELECT IFNULL(c_sludge,0) FROM tbl_customer WHERE c_uid ='$d_customeruid' ";
+$qry_sludge = "SELECT IFNULL(c_sludge,0) as c_sludge FROM tbl_customer WHERE c_uid ='$d_customeruid' ";
 $rt_sludge = $jdb->fQuery($qry_sludge, "fetch query error");
 
 	
@@ -426,7 +426,7 @@ $(document).ready(function(){
 				<td class="td-text-info">
 					<div class="number-input">
 						<button class="left" type="button">▼</button>
-							<input type="number" id="d_sludge" name="d_sludge" class="d_sludge" value="<?=$rt_sludge['c_sludge']?>" min="0" max="100" placeholder="50">
+							<input type="number" id="d_sludge" name="d_sludge" class="d_sludge" value="<?= (isset($d_sludge) && trim((string)$d_sludge) !== '') ? $d_sludge : $rt_sludge['c_sludge'] ?>" min="0" max="100" placeholder="50">
 						<button class="right" type="button">▲</button>
 					</div>
 				</td>