Template:Fix/category

Lua error in Module:Effective_protection_level at line 63: attempt to index field 'ext' (a nil value).{{#if:

 |[[{{{cat-date}}} {{#if:
  |from {{{date}}}
 }}]]{{#if:
  |{{#ifexist:{{{cat-date}}} from {{{date}}}|
   |
  }}
 }}
}}{{#if:|{{{cat2}}}}}{{#if:
 |[[{{{cat-date2}}} {{#if:
  |from {{{date}}}
 }}]]{{#if:
  |{{#ifexist:{{{cat-date2}}} from {{{date}}}|
   |
  }}
 }}
}}{{#if:|{{{cat3}}}}}{{#if:
 |[[{{{cat-date3}}} {{#if:
  |from {{{date}}}
 }}]]{{#if:
  |{{#ifexist:{{{cat-date3}}} from {{{date}}}|
   |
  }}
 }}
}}