Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
This PR is created to fix this error. I was able to recreate the error and has done some small changes in order to fix it.
There are mainly two things that have changed. The register_activation_hook() has been introduced. It is true that this is not called during an update. However, it seems to be necessary during plugin initiation.
$sql CREATE TABLE IF NOT EXISTS has been changed to CREATE TABLE. This is the way it is structured in the WordPress documentation. It seems to be the case that dbDelta() does not require IF NOT EXISTS, but will instead discern this itself.
As part of testing I've deleted, installed, upgraded the database, with and without orders. It seems to work as it should,
Please review this PR.