Actually there is no url just blank space, check img below
If i add new product then it's ok but all old one have blank space,
here is code from inspect element:- (for old products)
<td onclick="document.location = 'index.php?controller=AdminProducts&id_product=2743&updateproduct&token=6e6d58db44bb64ded4d6e960318817b9'" class="pointer center">
</td>
here is code from inspect element:- (for recent uploaded products)
<td onclick="document.location = 'index.php?controller=AdminProducts&id_product=2745&updateproduct&token=6e6d58db44bb64ded4d6e960318817b9'" class="pointer center">
<img class="imgm img-thumbnail" alt="" src="../img/tmp/product_mini_2745_1.jpg?time=1413454427">
</td>
Actually what i found that in img/tmp folder all old images are in this format:- product_mini_productid.jpg while the new uploaded images also have "_1" in last like:- product_mini_productid_1.jpg
i have regenerated all images but no effect and if i upload images again in old products then it works and new image saved by a name:- product_mini_productid_1.jpg