Classic report - Condition evaluated for every row

APEX 4.2.2
I am seeing something strange in a classic report region. A report started to fail at run-time with a strange error about bad syntax. When I run the page in debug mode, I see the following
print column headings
rows loop: 30 row(s)
...Execute Statement: begin wwv_flow.g_boolean := '' is not null;
end;
......Result = false
...Execute Statement: begin wwv_flow.g_boolean := '' is not null;
end;
......Result = false
...Execute Statement: begin wwv_flow.g_boolean := 'string with a embedded ' single quote' is not null;
end;
......Result = true
Looks like the APEX engine is evaluating a boolean expression after rendering and each and every row in the report. And for some strange reason, it is using a piece of data from my query's resultset and failing because of the bad syntax introduced due to the single-quote in the string.
I have never seen this before. Any idea what is going on?
Thanks

Howdy Paul, sorry should have provided all the details. No, this is a standard generic column template. Ah, you are right, drat I should have looked closer. The template has use a condition to show either a highlighted row or normal one. Sorry for the false alarm, I can take it from here. Enjoy your flight :-)

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