html - PHP While Loop Help- "Warning: mysqli_fetch_assoc() expects parameter 1 to be mysqli_result......"

Beware, I am a coding n00b and just got a basic PHP assignment. I keep getting this error message when I try to open this up

Warning: mysqli_fetch_assoc() expects parameter 1 to be mysqli_result, boolean given in /home/jpl8ce/public_html/php_grocery1.php on line 20

Here is my .php and .html files that go with what I'm doing. Basically, its a grocery database where I'm trying to print the store hours, address, and name of the store that has the item that the user inputs in the form.

$connect = mysqli_connect("localhost","jpl8ce","jpl8ce@siedb","grocery");
$item_name = $_post["input1"];

$query_String = " SELECT Stores.Name, Price, Address, Open_Time, Close_Time
FROM (Stores JOIN Carry ON Stores.Store_ID = Carry.Store_ID) JOIN Items ON Carry.Product_ID = Items.Product_ID
WHERE Items.name = $item_name

ORDER BY Close_Time DESC";


$result = mysqli_query($connect, $query_String);

while ($row = mysqli_fetch_assoc($result)) 
{

echo '
'.$row["Stores.Name"].', '.'
'; 
//echo '$' number_format($row["Price"],2).', ';

echo '
'.$row["Address"] .', '.'
';
echo '
'.$row["Open_Time"] .', '.'
';
echo '
'.$row["Close_Time"].'
';
}

mysqli_close($connect);  
?>

Here is my HTML code

 Grocery Database Search! 


 Use this Search Engine to input a name of an item.
After clicking the Search button, the price of the item, as well as the address and hours of the store 
the item is located at will be displayed. 


Item: 

Thanks again guys!