Use report.longreprtext to log exception insted of str(report.longrepr). Following https://docs.pytest.org/en/latest/writing_plugins.html, the report.longrepr is still checked to find an exceptions.

Author: Nikita Voronchev

pytest_reportportal/plugin.py

@@ -23,7 +23,7 @@ def pytest_runtest_makereport(self, item, call):
         report = (yield).get_result()
 
         if report.longrepr:
-            PyTestService.post_log(cgi.escape(str(report.longrepr)), logging.ERROR)
+            PyTestService.post_log(cgi.escape(report.longreprtext), logging.ERROR)
 
         if report.when == "setup":