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2 changes: 1 addition & 1 deletion lib/index.js
Original file line number Diff line number Diff line change
Expand Up @@ -74,7 +74,7 @@ function Pattern(source, formatCharacters, placeholderChar, isRevealingMask) {
}

/** Placeholder character */
this.placeholderChar = placeholderChar || DEFAULT_PLACEHOLDER_CHAR
this.placeholderChar = typeof placeholderChar === 'string' ? placeholderChar : DEFAULT_PLACEHOLDER_CHAR
/** Format character definitions. */
this.formatCharacters = formatCharacters || DEFAULT_FORMAT_CHARACTERS
/** Pattern definition string with escape characters. */
Expand Down