I’ve been working with Liquid for a while now, and one thing I’ve learned is how easy it’s to accidentally break something, especially when customizing a Shopify theme.
Recently I helped someone who was trying to use {{ variable }} for logic. It reminded me how confusing the difference between {{ }} and {% %} can be. If you’ve been there, you know: {{ }} is just for output, not logic. It won’t give you an erro, it’ll just do… nothing.
Another time, someone was trying to access a custom metafield without checking if the object existed first. No errors, no warnings just a blank space where something should be. Liquid doesn’t crash like other languages; it just quietly fails. That’s why I always check if the object exists before using it.
And then there’s the good old variable overwriting inside loops. I’ve seen devs (including myself) reuse variable names inside nested for loops, only to realize much later that they accidentally overwrote something important… It’s such a subtle bug, and it can drive you crazy.
These kinds of issues happen to all of us, especially when you’re moving fast or experimenting with new features. Curious to know, have you ever made a Liquid mistake that took you way too long to catch? Would love to hear what others have run into.