Fix bug in helpdata dialog where some tech requirements could be null.

jlertle · Mar 16, 2015 · 2bfb4af · 2bfb4af
1 parent 496e108
commit 2bfb4af
Showing 1 changed file with 2 additions and 2 deletions.
diff --git a/freeciv-web/src/main/webapp/javascript/helpdata.js b/freeciv-web/src/main/webapp/javascript/helpdata.js
@@ -216,11 +216,11 @@ function generate_help_text(key)
     msg += "<br>Vision: " + punit_type['vision_radius_sq'];
 
     var ireq = get_improvement_requirements(punit_type['impr_requirement']);
-    if (ireq != null) {
+    if (ireq != null && techs[ireq] != null) {
       msg += "<br>Building Requirements: " + techs[ireq]['name'];
     }
     var treq = punit_type['tech_requirement'];
-    if (treq != null) {
+    if (treq != null && techs[treq] != null) {
       msg += "<br>Tech Requirements: " + techs[treq]['name'];
     }
     msg += "<br><br><button class='help_button' onclick=\"show_wikipedia_dialog('" + punit_type['name'] + "');\">Wikipedia on "