That’s a possibility. Check the web log and correlate the time of the error 
with the request that generated it, then you’ll see what the query was.

All the best,

  - Aparajita

> On Apr 13, 2017, at 4:36 AM, Oliver Brodwolf <[email protected]> wrote:
> 
> Hello
> 
> Could it be, that you submit more then one parameter with the name selected?
> 
> I tested your code with ?selected=12&selected=13
> And then geht the same error, because Active4D  creates an array from 
> selected.
> 
> a4d.debug.dump collection (_query)   // will return  selected [0] {"", "12", 
> "13"}
> 
> 
> Regards, Oliver
> 
> 
> 
> 
>> Am 13.04.2017 um 06:05 schrieb Justin Will <[email protected]>:
>> 
>> Apr 12 18:52:45 Active4D: [error] An operation on incompatible types was 
>> attempted: /F/a4dweb/50000/includes/programStandard.a4d, line 26
>> 
>> Apr 12 13:51:23 Active4D: [error] An operation on incompatible types was 
>> attempted (expected a numeric expression or a text expression or a boolean 
>> expression): /F/a4dweb/50000/includes/programStandard.a4d, line 27
>> Apr 12 13:51:23 Active4D: [error] An operation on incompatible types was 
>> attempted (expected a numeric expression or a text expression or a boolean 
>> expression): /F/a4dweb/50000/includes/programStandard.a4d, line 27
>> Apr 12 14:27:46 Active4D: [error] An operation on incompatible types was 
>> attempted (expected a numeric expression or a text expression or a boolean 
>> expression): /F/a4dweb/50000/includes/programStandard.a4d, line 27
>> 
>> Here's the lines of code called out as erroring.
>> 
>> $vtProgID:=_query{"program_id"}
>> $vnSelected:=Num(_query{"selected"})
>> 
>> The following declarations are slightly above the assigments.
>> 
>> C_Longint($vnSelected)
>> C_Text($vtProgID)
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