Index: binaries/data/mods/public/gui/credits/texts/programming.json
===================================================================
--- binaries/data/mods/public/gui/credits/texts/programming.json
+++ binaries/data/mods/public/gui/credits/texts/programming.json
@@ -28,6 +28,7 @@
 				{ "nick": "Alan", "name": "Alan Kemp" },
 				{ "nick": "Alex", "name": "Alexander Yakobovich" },
 				{ "nick": "alpha123", "name": "Peter P. Cannici" },
+				{ "nick": "Ampaex", "name": "Antonio Vazquez" },
 				{ "name": "André Puel" },
 				{ "nick": "andy5995", "name": "Andy Alt" },
 				{ "nick": "Angen" },
Index: binaries/data/mods/public/simulation/helpers/Commands.js
===================================================================
--- binaries/data/mods/public/simulation/helpers/Commands.js
+++ binaries/data/mods/public/simulation/helpers/Commands.js
@@ -734,6 +734,14 @@
 			}
 
 			var cmpTechnologyManager = QueryOwnerInterface(ent, IID_TechnologyManager);
+
+			//Check if the player requiring a technology has cmpTecnologyManager
+			if(cmpUpgrade.GetRequiredTechnology(cmd.template) && !cmpTechnologyManager){
+				if (g_DebugCommands)
+					warn("Invalid command: the selected player cannot upgrade this technology : " + uneval(cmd));
+				continue;
+			}
+
 			if (cmpUpgrade.GetRequiredTechnology(cmd.template) && !cmpTechnologyManager.IsTechnologyResearched(cmpUpgrade.GetRequiredTechnology(cmd.template)))
 			{
 				if (g_DebugCommands)