WARNING Division by zero

Hey,

This happened yesterday:

WARNING Division by zero

{
"error": {
    "errno": 2,
    "errstr": "Division by zero",
    "errfile": "\/path\/to\/wp-content\/plugins\/woocommerce-auto-added-coupons-pro\/templates\/coupon-select-free-product.php",
    "errline": 51
},
"backtrace": [{
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    "lineNumber": 51,
    "arguments": ["\/path\/to\/wp-content\/plugins\/woocommerce-auto-added-coupons-pro\/templates\/coupon-select-free-product.php"],
    "applicationFrame": true,
    "method": "include",
    "class": null
}, {
    "file": "\/path\/to\/wp-content\/plugins\/woocommerce-auto-added-coupons-pro\/pro\/class-wjecf-pro-controller.php",
    "lineNumber": 327,
    "arguments": ["coupon-select-free-product.php", {
        "coupon": {},
        "coupon_code": "shred",
        "allow_multiple_products": false,
        "form_items": [],
        "selected_quantity": 0,
        "max_quantity": 1,
        "name_prefix": "wjecf_free_sel[0]",
        "id_prefix": "wjecf_free_sel_0",
        "totalizer_id": "wjecf_free_sel_0_total_qty",
        "template": {}
    }],
    "applicationFrame": true,
    "method": "include_template",
    "class": "WJECF_Pro_Controller"
}, {
    "file": "\/path\/to\/wp-content\/plugins\/woocommerce-auto-added-coupons-pro\/pro\/plugins\/WJECF_Pro_Free_Products\/class-wjecf-pro-free-products-template.php",
    "lineNumber": 157,
    "arguments": ["coupon-select-free-product.php", {
        "coupon": {},
        "coupon_code": "shred",
        "allow_multiple_products": false,
        "form_items": [],
        "selected_quantity": 0,
        "max_quantity": 1,
        "name_prefix": "wjecf_free_sel[0]",
        "id_prefix": "wjecf_free_sel_0",
        "totalizer_id": "wjecf_free_sel_0_total_qty"
    }],
    "applicationFrame": true,
    "method": "render_template",
    "class": "WJECF_Pro_Free_Products_Template"
}, {
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    "lineNumber": 47,
    "arguments": ["\/path\/to\/wp-content\/plugins\/woocommerce-auto-added-coupons-pro\/templates\/checkout\/select-free-product.php"],
    "applicationFrame": true,
    "method": "include",
    "class": null
}, {
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    "lineNumber": 327,
    "arguments": ["checkout\/select-free-product.php", {
        "free_gift_coupons": [{}],
        "coupons_form_data": {
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                "coupon": {},
                "coupon_code": "shred",
                "allow_multiple_products": false,
                "form_items": [],
                "selected_quantity": 0,
                "max_quantity": 1,
                "name_prefix": "wjecf_free_sel[0]",
                "id_prefix": "wjecf_free_sel_0",
                "totalizer_id": "wjecf_free_sel_0_total_qty"
            }
        },
        "template": {}
    }],
    "applicationFrame": true,
    "method": "include_template",
    "class": "WJECF_Pro_Controller"
}, {
    "file": "\/path\/to\/wp-content\/plugins\/woocommerce-auto-added-coupons-pro\/pro\/plugins\/WJECF_Pro_Free_Products\/class-wjecf-pro-free-products-template.php",
    "lineNumber": 157,
    "arguments": ["checkout\/select-free-product.php", {
        "free_gift_coupons": [{}],
        "coupons_form_data": {
            "shred": {
                "coupon": {},
                "coupon_code": "shred",
                "allow_multiple_products": false,
                "form_items": [],
                "selected_quantity": 0,
                "max_quantity": 1,
                "name_prefix": "wjecf_free_sel[0]",
                "id_prefix": "wjecf_free_sel_0",
                "totalizer_id": "wjecf_free_sel_0_total_qty"
            }
        }
    }],
    "applicationFrame": true,
    "method": "render_template",
    "class": "WJECF_Pro_Free_Products_Template"
}, {
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    "lineNumber": 228,
    "arguments": [""],
    "applicationFrame": true,
    "method": "render_checkout_select_free_product",
    "class": "WJECF_Pro_Free_Products"
}, {
    "file": "\/path\/to\/wp-includes\/class-wp-hook.php",
    "lineNumber": 292,
    "arguments": ["", [""]],
    "applicationFrame": true,
    "method": "apply_filters",
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}, {
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    "lineNumber": 316,
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        [""]
    ],
    "applicationFrame": true,
    "method": "do_action",
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}, {
    "file": "\/path\/to\/wp-includes\/plugin.php",
    "lineNumber": 484,
    "arguments": ["woocommerce_checkout_before_customer_details"],
    "applicationFrame": true,
    "method": "do_action",
    "class": null
}, {
    "file": "\/path\/to\/wp-content\/themes\/enhanced\/woocommerce\/checkout\/form-checkout.php",
    "lineNumber": 47,
    "arguments": ["\/path\/to\/wp-content\/themes\/enhanced\/woocommerce\/checkout\/form-checkout.php"],
    "applicationFrame": true,
    "method": "include",
    "class": null
}, {
    "file": "\/path\/to\/wp-content\/plugins\/woocommerce\/includes\/wc-core-functions.php",
    "lineNumber": 345,
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        "checkout": {}
    }],
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    "arguments": [],
    "applicationFrame": true,
    "method": "checkout",
    "class": "WC_Shortcode_Checkout"
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    "lineNumber": 67,
    "arguments": [""],
    "applicationFrame": true,
    "method": "output",
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        ["WC_Shortcode_Checkout", "output"], ""
    ],
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}, {
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    "lineNumber": 95,
    "arguments": ["", "", "woocommerce_checkout"],
    "applicationFrame": true,
    "method": "checkout",
    "class": "WC_Shortcodes"
}, {
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    "lineNumber": 343,
    "arguments": [
        ["[woocommerce_checkout]", "", "woocommerce_checkout", "", "", "", ""]
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    "method": "do_shortcode_tag",
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    "applicationFrame": true,
    "method": "apply_filters",
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}