There are several cases where the CustomTags require other CustomTags inside for their correct visualization, however, in the new versions of ibexa 3.3 there may be some problems. If you are editing content that contains a "parent" CustomTag that in turn has child CustomTags, you must make sure that the parent has at least one blank space before the child CustomTags, otherwise the error will appear:

"trim() expects parameter 1 to be string, bool given".

After several tests, it was identified that the above error is generated during rendering and after having stored the xml content in the database, this type of error generates a huge crash, since it does not allow to modify or display the content.

Here is an example of the XML fragment in the database that does NOT generate an error:

Here is an example of the XML fragment with the trim error:

As evidenced in the previous images, Ibexa generates an error due to the lack of content such as the blank space <para> </para> (on line 3).

The editor requires removing the white space at the beginning of CustomTag, and at the moment of doing so, you can lose control of its content due to this error, it is serious.

Recreation:
1. Create a custom "parent" tag, for example an "Accordion":

2. Create a custom tag "child" inside the "parent", for example an "Accordion item"

3. Remove the space (paragraph) before the "Accordion item"

4. Save or publish the content. You will get the error: