If user enters two words in course search box, the error occurs:

ERROR: Incorrect number of query parameters. Expected 4, got 3.

More information about this error
Debug info:
Error code: invalidqueryparam
Stack trace:

line 821 of /lib/dml/moodle_database.php: dml_exception thrown
line 936 of /lib/dml/mysqli_native_moodle_database.php: call to moodle_database->fix_sql_params()
line 786 of /lib/datalib.php: call to mysqli_native_moodle_database->get_recordset_sql()
line 1042 of /lib/coursecatlib.php: call to get_courses_search()
line 1638 of /course/renderer.php: call to coursecat::search_courses()
line 101 of /course/search.php: call to core_course_renderer->search_courses()