diff --git a/packages/lib/factorio/export.js b/packages/lib/factorio/export.js
index 093e9be3..2e71dd08 100644
--- a/packages/lib/factorio/export.js
+++ b/packages/lib/factorio/export.js
@@ -90,7 +90,16 @@ async function loadFile(server, modVersions, modPath) {
 		}
 	}
 
-	let zip = await loadZip(server, modVersions, mod);
+	let zip;
+	try {
+		zip = await loadZip(server, modVersions, mod);
+	} catch (err) {
+		if (err.code === "ENOENT") {
+			return null;
+		}
+		throw err;
+	}
+
 	let file = zip.file(filePath);
 	if (!file) {
 		return null;
@@ -310,7 +319,15 @@ async function exportLocale(server, modVersions, modOrder, languageCode) {
 			continue;
 		}
 
-		let zip = await loadZip(server, modVersions, mod);
+		let zip;
+		try {
+			zip = await loadZip(server, modVersions, mod);
+		} catch (err) {
+			if (err.code === "ENOENT") {
+				continue;
+			}
+			throw err;
+		}
 		for (let file of zip.file(new RegExp(`locale\\/${languageCode}\\/.*\\.cfg`))) {
 			let content = await file.async("nodebuffer");
 			mergeLocale(ini.parse(content.toString("utf8")));
@@ -357,6 +374,28 @@ async function exportData(server) {
 		throw new Error("No items got exported");
 	}
 
+	// Some mod authors put leading zeros into the versions of their zip files.
+	let splitter = /^(.*)_(\d+)\.(\d+)\.(\d+)\.zip?$/;
+	for (let entry of await fs.readdir(server.writePath("mods"))) {
+		let match = splitter.exec(entry);
+		if (!match) {
+			continue;
+		}
+
+		let modVersion = `${match[2]}.${match[3]}.${match[4]}`;
+		let normalizedVersion =
+			`${Number.parseInt(match[2], 10)}.${Number.parseInt(match[3], 10)}.${Number.parseInt(match[4], 10)}`
+		;
+
+		if (modVersion === normalizedVersion) {
+			continue;
+		}
+
+		if (modVersions.get(match[1]) === normalizedVersion) {
+			modVersions.set(match[1], modVersion);
+		}
+	}
+
 	let { iconSheet, itemData } = await exportItems(server, modVersions, items);
 	let locale = await exportLocale(server, modVersions, modOrder, "en");
 
diff --git a/packages/lib/factorio/server.js b/packages/lib/factorio/server.js
index d61b49c9..5b08447a 100644
--- a/packages/lib/factorio/server.js
+++ b/packages/lib/factorio/server.js
@@ -605,7 +605,11 @@ class FactorioServer extends events.EventEmitter {
 		let type = line.slice(channelEnd + 1, channelEnd + 2).toString("utf-8");
 		let content;
 		if (type === "j") {
-			content = JSON.parse(line.slice(channelEnd + 2).toString("utf-8"));
+			try {
+				content = JSON.parse(line.slice(channelEnd + 2).toString("utf-8"));
+			} catch (err) {
+				throw new Error(`Malformed JSON to ${channel}: ${line.slice(channelEnd + 2).toString("utf-8")}`);
+			}
 
 		} else if (type === "f") {
 			let fileName = line.slice(channelEnd + 2).toString("utf-8");
diff --git a/packages/slave/lua/export/data-final-fixes.lua b/packages/slave/lua/export/data-final-fixes.lua
index c4f0e7d3..335ac5c1 100644
--- a/packages/slave/lua/export/data-final-fixes.lua
+++ b/packages/slave/lua/export/data-final-fixes.lua
@@ -46,11 +46,14 @@ end
 -- no game.table_to_json here :(
 local function table_to_json(data)
     if type(data) == "number" then
+		if data == math.huge then return "1e500" end -- Inf is not representable in JSON, but 1e500 will overflow to it.
+		if data == -math.huge then return "-1e500" end
+		if data ~= data then return "0" end -- NaN is not representable in JSON, treat as 0 instead.
         return string.format("%.17g", data)
 
     elseif type(data) == "string" then
         data = data:gsub('([\x00-\x1f\\"])', function(match)
-            return "\\x" .. string.format("%02x", match:byte())
+            return "\\u00" .. string.format("%02x", match:byte())
         end)
         return '"' .. data .. '"'