diff --git a/lib/check.sh b/lib/check.sh
new file mode 100644
index 0000000..a6edd69
--- /dev/null
+++ b/lib/check.sh
@@ -0,0 +1,27 @@
+#!/usr/bin/env bash
+# -----------------------------------------------------------------------------
+# bat-extras | Copyright (C) 2020 eth-p | MIT License
+#
+# Repository: https://github.com/eth-p/bat-extras
+# Issues:     https://github.com/eth-p/bat-extras/issues
+# -----------------------------------------------------------------------------
+
+# Checks that the file or directory exists.
+# Arguments:
+#    1  -- The path to check.
+check_exists() {
+	[[ -e "$1" ]] && return 0
+	
+	print_error "%s: No such file or directory" "$1"
+	return 1
+}
+
+# Checks that the file is a file.
+# Arguments:
+#    1  -- The path to check.
+check_is_file() {
+	[[ -f "$1" ]] && return 0
+	
+	print_error "%s: Not a file" "$1"
+	return 1
+}
diff --git a/src/prettybat.sh b/src/prettybat.sh
index a03281d..49d44cd 100755
--- a/src/prettybat.sh
+++ b/src/prettybat.sh
@@ -13,6 +13,7 @@ source "${LIB}/opt_hook_version.sh"
 source "${LIB}/str.sh"
 source "${LIB}/print.sh"
 source "${LIB}/version.sh"
+source "${LIB}/check.sh"
 # -----------------------------------------------------------------------------
 # Init:
 # -----------------------------------------------------------------------------
@@ -178,6 +179,10 @@ process_file() {
 	local fext="$ext"
 	local lang="${ext:1}"
 	local formatter
+	
+	# Check that the file exists, and is a file.
+	check_exists  "$file" || return 1
+	check_is_file "$file" || return 1
 
 	# Determine the formatter.
 	if [[ -n "$OPT_LANGUAGE" ]]; then