diff --git a/job.go b/job.go
index 341d396..8a86ba4 100644
--- a/job.go
+++ b/job.go
@@ -803,29 +803,39 @@ func jobGStock(j Job) {
 			item, err := getObjItem(v.ItemID64)
 			logOnError(err, "jobGStock : getObjItem")
 			if err == nil {
-				totalSize += item.Weight * v.Quantity
-				switch item.ItemTypeID {
-				case objSubTypeItemResource:
-					resSize += item.Weight * v.Quantity
-					resCount += v.Quantity
-				case objSubTypeItemAlch:
-					alchSize += item.Weight * v.Quantity
-					alchCount += v.Quantity
-				case objSubTypeItemMisc:
-					miscSize += item.Weight * v.Quantity
-					miscCount += v.Quantity
-				case objSubTypeItemRecipe:
-					recSize += item.Weight * v.Quantity
-					recCount += v.Quantity
-				case objSubTypeItemPart:
-					partSize += item.Weight * v.Quantity
-					partCount += v.Quantity
-				case objSubTypeItemOther:
-					otherSize += item.Weight * v.Quantity
-					otherCount += v.Quantity
+				if item.Weight != -1 {
+					totalSize += item.Weight * v.Quantity
+					switch item.ItemTypeID {
+					case objSubTypeItemResource:
+						resSize += item.Weight * v.Quantity
+						resCount += v.Quantity
+					case objSubTypeItemAlch:
+						alchSize += item.Weight * v.Quantity
+						alchCount += v.Quantity
+					case objSubTypeItemMisc:
+						miscSize += item.Weight * v.Quantity
+						miscCount += v.Quantity
+					case objSubTypeItemRecipe:
+						recSize += item.Weight * v.Quantity
+						recCount += v.Quantity
+					case objSubTypeItemPart:
+						partSize += item.Weight * v.Quantity
+						partCount += v.Quantity
+					case objSubTypeItemOther:
+						otherSize += item.Weight * v.Quantity
+						otherCount += v.Quantity
+					}
+				} else {
+					w := TGCommand{
+						Type:       commandSendMsg,
+						Text:       fmt.Sprintf("Unknown weight for item : %s - %s\n", item.Code, item.Name),
+						ToUserID64: cfg.Bot.Admin,
+					}
+					TGCmdQueue <- w
 				}
 			}
 		}
+
 		txt := fmt.Sprintf("Current stock [%d/38000] :\n  - Resources  : %d (%d)\n  - Alchemist  : %d (%d)\n  - Misc stuff : %d (%d)\n  - Recipes    : %d (%d)\n  - Parts      : %d (%d)\n  - Other      : %d (%d)\n", totalSize, resSize, resCount, alchSize, alchCount, miscSize, miscCount, recSize, recCount, partSize, partCount, otherSize, otherCount)
 
 		m := TGCommand{