Index: binaries/data/mods/public/globalscripts/ModificationTemplates.js
===================================================================
--- binaries/data/mods/public/globalscripts/ModificationTemplates.js
+++ binaries/data/mods/public/globalscripts/ModificationTemplates.js
@@ -164,9 +164,9 @@
 	let effect = {};
 	if (template.Add)
 		effect.add = +template.Add;
-	if (template.Multiply)
+	if (template.Multiply !== undefined)
 		effect.multiply = +template.Multiply;
-	if (template.Replace)
+	if (template.Replace !== undefined)
 		effect.replace = template.Replace;
 	effect.affects = template.Affects ? template.Affects._string.split(/\s/) : [];
 
Index: binaries/data/mods/public/globalscripts/Technologies.js
===================================================================
--- binaries/data/mods/public/globalscripts/Technologies.js
+++ binaries/data/mods/public/globalscripts/Technologies.js
@@ -25,7 +25,7 @@
 			continue;
 		if (modification.replace !== undefined)
 			return modification.replace;
-		if (modification.multiply)
+		if (modification.multiply !== undefined)
 			multiply *= modification.multiply;
 		else if (modification.add)
 			add += modification.add;