Not fixed, there is a comparison of boolean and string
core/filter_api.php 3880 - - check_checked ( <boolean>false, <string>'on' )

There is code where the setting is treated as a boolean
$f_do_filter_by_date = gpc_get_bool( FILTER_PROPERTY_FILTER_BY_DATE );
but also code where it's a string
$f_do_filter_by_date = $f_do_filter_by_date ? 'on' : 'off';

Can you explain how you triggered the error? It would ease debugging (this filter api is a bitch...).

this filter api is a bitch
I know ...

1) click "View Issues"
2) click "Use Date Filters"

get

APPLICATION ERROR 0000026

Data Type mismatch. Enable detailed error messages for further information.

Please use the "Back" button in your web browser to return to the previous page. There you can correct whatever problems were identified in this error or select another action. You can also click an option from the menu bar to go directly to a new section.

Full path: /Applications/MAMP/htdocs/mantisbt/master/core/helper_api.php

Line: 191

Variable    Value   Type

p_var1      boolean

p_var2  on  string

p_strict    1   boolean

Filename    Line            Function    Args

/Applications/MAMP/htdocs/mantisbt/master/core/helper_api.php   191 -   -   trigger_error   ( <string>'26', <integer>256 )

/Applications/MAMP/htdocs/mantisbt/master/core/helper_api.php   240 -   -   helper_check_variables_equal    ( <boolean>false, <string>'on', <boolean>true )

/Applications/MAMP/htdocs/mantisbt/master/core/filter_api.php   3880    -   -   check_checked   ( <boolean>false, <string>'on' )








print_filter_do_filter_by_date  -

/Applications/MAMP/htdocs/mantisbt/master/return_dynamic_filters.php    133 -   -   call_user_func  ( <string>'print_filter_do_filter_by_date' )

Caused by wrong adodb version.
I followed the instructions at http://www.mantisbt.org/docs/master/en-US/Developers_Guide/html-single/#dev.contrib.clone

git clone git@github.com:mantisbt/mantisbt.git
cd mantisbt
git submodule update --init

After that you have adodb version 5.10 in master branch. (also in nightly builds of master branch)

Replacing 5.10 by 5.18 fixes the issue.

Replacing 5.10 by 5.18 fixes the issue.
I was a bit doubtful when I wrote this, as I saw no relation between the issue and adodb.

The change did not explain that line 3888 of filter_api.php should be no longe a comparison of boolean and string

check_checked( $t_filter[FILTER_PROPERTY_FILTER_BY_DATE], 'on' )

I tried on another platform and I still get the issue.

Take 2. Hopefully that will work better ;-)

My testing for earlier commit did not take all cases into consideration (i.e. with a reset filter)