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Using condition to find if [A] or [B] endswith .com null error

I'm trying to write a flow that verifies the ending of two previous compose items.  I only want it to continue if one of them endswith .com (I'm making sure the outputs are emails and are being parsed correctly with compose) but no matter what I do, I keep getting the same error about an item being null


Unable to process template language expressions for action 'recipients_or_recipients_.com_validation' at line '1' and column '2816': 'The template language function 'endsWith' expects its first argument 'collection' to be a dictionary (object), an array or a string. The provided value is of type 'Null'.'.


Below is a screenshot of the step that is causing the error to occur:


The "outputs" are 2 different items (A) (B) and bring back proper results in my tests.  The step below happens before the above control.


My entire flow is below:


Not sure why my "compose" items are being labeled as 'Null'.  



Community Champion
Community Champion

Where are both compose acrion blocks in the context of your flow?
If they are in different branches of a previous condition, then it is normal that one of them is null
If so, my suggestion is to evaluate an expression based on the coalesce() function instead, using the compose action as first input, and whatever string (for example '') as the second input
Hope this helps

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So I think what you are saying is right.  The first yes/no condition is successful it is "yes" and utilizes the recipients compose.  If it's "no" and uses the recipient compose, it will throw the null error.


If my current logic is just not going to work, I will look into the coalesce() function as you have recommended.

You can also use a string variable instead by means on 'Initialize variable' action block.
Initialize it before your first condition, if true branch set variable to value A by means of 'Set variable' action block, if false branch set variable to value B. Next condition evaluates variable value, no need for two composes.
Hope this also helps

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Thank you for that suggestion.  I'm really just starting out with expressions and things like that so maybe you can explain more about your variable idea.


The email that comes in either has 2 values in it; Receipientor Recipient.


When the email has only "Recipient", I need to use a very slightly different compose to parse the correct information.  When the email has Recipients, I need to use a different expression.


Recipients - 

last(split(first(split(body('Html_to_text'), 'Subject')), 'Recipients'))
Recipient - 
last(split(first(split(body('Html_to_text'), 'Subject')), 'Recipient'))
What i've now done is split into another condition:
If body contains Recipients, then if compose(recipients) ends with .com, send X message, if not send Y message.
If body contains Recipient, then if compose(recipient) ends with .com, send A message, if not send B message.
I'm simply not understanding how initiating a variable will save time in my scenario and hoping a little bit more of an explanation will help me understand and further my comprehension of microsoft flow.

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