diff --git a/cmd_shell.nim b/cmd_shell.nim
index 6a1b321..4c355eb 100644
--- a/cmd_shell.nim
+++ b/cmd_shell.nim
@@ -1,8 +1,8 @@
 import cliutils, linenoise, os, osproc, sequtils, strutils
 
 proc writeOutput(msg, errMsg: TaintedString, cmd: string): void =
-  if msg != nil: stdout.writeLine(msg)
-  if errMsg != nil: stderr.writeLine(errMsg)
+  if not msg.isEmptyOrWhitespace: stdout.writeLine(msg)
+  if not errMsg.isEmptyOrWhitespace: stderr.writeLine(errMsg)
 
 when isMainModule:
 
@@ -27,4 +27,3 @@ when isMainModule:
     discard exec(cmd & " " & args & $line, "", [], nil, {poUsePath, poEvalCommand}, writeOutput)
     historyAdd(line)
     line = readLine(cmdPrompt & "> ")
-
diff --git a/cmd_shell.nimble b/cmd_shell.nimble
index 420297d..fec6103 100644
--- a/cmd_shell.nimble
+++ b/cmd_shell.nimble
@@ -1,6 +1,6 @@
 # Package
 
-version       = "0.1.0"
+version       = "1.0.0"
 author        = "Jonathan Bernard"
 description   = "Wrapper around CLI commands (passing input as arguments)."
 license       = "MIT"