<h4>Solutions Catalog Module Fixes</h4><ul><li><strong>Fixed:</strong> Deprecated optional parameter before required in SolutionModel.php line 459 — $lastid=null before $limit. Removed default value.</li><li><strong>Fixed:</strong> Undefined variables ($webmod, $page, $limit, $category_id) in getSolutionsMember() and searchSolutions() — extract($request) did not create these variables when not sent in POST. Added null coalescing defaults.</li><li><strong>Fixed:</strong> Undefined variable $solution_list_id in getSolutionListJson(), getSolutionDetailMember(), and getSolutionData() — added fallback to check both solution_list_id and solution_id keys.</li><li><strong>Fixed:</strong> Undefined variable $section_col_size in getSectionTable() — added null coalescing fallback.</li><li><strong>Fixed:</strong> str_replace() null deprecation in removeSpecialChars() line 994 — $string parameter could be null. Added ?? "" fallback.</li><li><strong>Fixed:</strong> Undefined variable $page_title_1 in solution_detail.php line 244 — added ?? "Solutions" fallback.</li></ul>