Conditional Expression – ExpressionParser error

Hey there.

First of all, lovely plugin, thanks for making this available for all of us.

Having an issue with Conditional Expression:
After setting up the logic, at the frontend (customer) side, the total can’t be calculated and got ExpressionParser: Prepared expression has incorrect type. instead.

Here’s the logic:
if {width} * {height} > 1000 = {width} * {height} * {product_price} * 0.5
else {width} * {height} * {product_price}

Where width and height are Number Field type.

Whereas using Single Line Formula with {width} * {height} * {product_price} works.

Here’s debug.log:

width = 1
height = 2
product_price = 2
product_weight = 
product_width = 
product_height = 
product_length = 
product_regular_price = 2
is_user_logged = 1
quantity = 1
PHP Warning:  Array to string conversion in path\to\my\weird\wordpress\wp-content\plugins\wc-kalkulator\src\ExpressionParser.php on line 96

Using version 1.3.2