diff --git a/src/const.ts b/src/const.ts
index 84f20c5..26cea53 100644
--- a/src/const.ts
+++ b/src/const.ts
@@ -1,3 +1,3 @@
 export const TAG_UNESCAPED = ['\\', ' ', ';', '\r', '\n']
-export const TAG_UNESCAPED_REGEX = [/\\\\/g, / /g, /;/g, /\r/g, /\n/g]
+export const TAG_UNESCAPED_REGEX = [/\\/g, / /g, /;/g, /\r/g, /\n/g]
 export const TAG_ESCAPED = ['\\\\', '\\s', '\\:', '\\r', '\\n']
diff --git a/src/formatting.ts b/src/formatting.ts
index 0c13076..4ecd1b5 100644
--- a/src/formatting.ts
+++ b/src/formatting.ts
@@ -33,7 +33,7 @@ export function format ({ tags, source, command, params }: FormatArgs) {
 
   outs.push(command)
 
-  if (params) {
+  if (params?.length) {
     const paramCopy = [...params]
     let last = paramCopy.pop()
 
diff --git a/src/line.ts b/src/line.ts
index 473ecf4..53f10f4 100644
--- a/src/line.ts
+++ b/src/line.ts
@@ -56,8 +56,9 @@ export class Line {
   }
 }
 
-function unescapeTag (value: string) {
+function unescapeTag (value?: string) {
   let unescaped = ''
+  if (!value) return unescaped
   const escaped = value.split('')
   while (escaped.length) {
     const current = escaped.shift() as string
@@ -102,7 +103,7 @@ function _tokenise (line: string) {
   if (!params.length) throw TypeError('Cannot tokenise command-less line')
   const command = (params.shift() as string).toLocaleUpperCase()
 
-  if (trailing) params.push(trailing)
+  if (typeof trailing === 'string') params.push(trailing)
 
   return new Line({
     tags,