Uncaught error: call to a member function get_results() on null

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Getting error call to member function get_results on null. I include one file in another Why this error occur.
Here is screenshot-https://prnt.sc/wgpznd[^]

here is code-

<table border="1">
	<tr>
	<th>Id</th>
	<th>Name</th>
	<th>Email</th>
	<th>Gender</th>
	<th>Age</th>
	<th>Edit</th>
	<th>Delete</th>
	</tr> 

	<?php
	global $wpdb;
	$table= 'wp_contact_form';
	$result = $wpdb->get_results ( "SELECT * FROM $table" );

	if(!empty($result)){

	foreach ( $result as $print ) {   
		?>
	<tr>
	<td><?php echo $print->id;?></td>
	<td><?php echo $print->names;?></td>
	<td><?php echo $print->emails;?></td>
	<td><?php echo $print->gender;?></td>
	<td><?php echo $print->age;?></td>
	<td><a href="/vishal_nov/edit-form-template/?upd=<?php echo $print->id ?>" name="update">Update</a></td>
	<td>
	<input type="button" value="Delete" id="delete" data-id = "<?php echo $print->id ?>" name="delete" class="del_btn">
	</td>
	</tr>
	<?php
	}
	}
	?>
</table>

What I have tried:

Changed table name

$wpdb->prefix.'contact form'

to

$table

.(wp_contact_form is table name and $table is variable in which table name is assign).

Posted 5-Jan-21 1:42am

vishal@1

Updated 5-Jan-21 17:27pm

v5

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Comments

Richard MacCutchan 5-Jan-21 7:44am

Look at line 25 as referred in the error message and you will be able to see which variable is null.

vishal@1 5-Jan-21 7:49am

there is no any null variable.

Richard MacCutchan 5-Jan-21 9:13am

Well that is what the error message states. And I am fairly sure it knows whether the variable is null or not.

Sandeep Mewara 5-Jan-21 8:22am

It would help others to help you if you share the code related.

vishal@1 5-Jan-21 22:57pm

I shared code above

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Dave Kreskowiak · Answer 1 · 2021-01-05T06:33:00

On line 25 of whatever script file it's talking about, you have something that looks like this:

... = someObjectName.get_results();

someObjectName is null. You and you're code are assuming something worked to build or retrieve someObjectName as you expected, but it didn't, resulting in a null value.

It's up to you to figure out why it's null.