diff --git a/services/StockService.php b/services/StockService.php
index 86c0b4f5..56b42b49 100644
--- a/services/StockService.php
+++ b/services/StockService.php
@@ -113,6 +113,12 @@ class StockService extends BaseService
 			throw new \Exception('Product does not exist or is inactive');
 		}
 
+
+		if ($amount <= 0)
+		{
+			throw new \Exception('Amount can\'t be <= 0');
+		}
+
 		$productDetails = (object)$this->GetProductDetails($productId);
 
 		// Tare weight handling
@@ -356,6 +362,11 @@ class StockService extends BaseService
 			throw new \Exception('Product does not exist or is inactive');
 		}
 
+		if ($amount <= 0)
+		{
+			throw new \Exception('Amount can\'t be <= 0');
+		}
+
 		if ($locationId !== null && !$this->LocationExists($locationId))
 		{
 			throw new \Exception('Location does not exist');