MariaDB keeps crashing

Hello,

I just installed new Debian Server with ISPConfig 3. Usually I've used MySQL but this time for some reason decided to go with MariaDB and I'm starting to think I shouldn't have...

The server is a small virtual server running two Wordpress + Woocommerce sites with very little traffic ~100 hits per day per site at the moment. Still MariaDB keeps crashing on what I think from error logs is a memory limit issue. The server has 1024MB memory + 512 SWAP partition.

Here's my error.log

Code:

2018-05-02 11:55:01 140538738451008 [Note] InnoDB: innodb_empty_free_list_algorithm has been changed to legacy because of small buffer pool size. In order to use backoff, increase buffer pool at least up to 20MB.

2018-05-02 11:55:01 140538738451008 [Note] InnoDB: Using mutexes to ref count buffer pool pages
2018-05-02 11:55:01 140538738451008 [Note] InnoDB: The InnoDB memory heap is disabled
2018-05-02 11:55:01 140538738451008 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2018-05-02 11:55:01 140538738451008 [Note] InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier
2018-05-02 11:55:01 140538738451008 [Note] InnoDB: Compressed tables use zlib 1.2.8
2018-05-02 11:55:01 140538738451008 [Note] InnoDB: Using Linux native AIO
2018-05-02 11:55:01 140538738451008 [Note] InnoDB: Using SSE crc32 instructions
2018-05-02 11:55:01 140538738451008 [Note] InnoDB: Initializing buffer pool, size = 128.0M
InnoDB: mmap(140574720 bytes) failed; errno 12
2018-05-02 11:55:01 140538738451008 [ERROR] InnoDB: Cannot allocate memory for the buffer pool
2018-05-02 11:55:01 140538738451008 [ERROR] Plugin 'InnoDB' init function returned error.
2018-05-02 11:55:01 140538738451008 [ERROR] Plugin 'InnoDB' registration as a STORAGE ENGINE failed.
2018-05-02 11:55:01 140538738451008 [Note] Plugin 'FEEDBACK' is disabled.
2018-05-02 11:55:01 140538738451008 [ERROR] Unknown/unsupported storage engine: InnoDB
2018-05-02 11:55:01 140538738451008 [ERROR] Aborting

Any ideas on how I should begin to debug this?