How to fire a cron every minute for two separate applications?

We have two Laravel (L5.7) applications running on a single server through virtual hosts. If I run:

crontab -e

through the terminal I see:

# Edit this file to introduce tasks to be run by cron.
#
# Each task to run has to be defined through a single line
# indicating with different fields when the task will be run
# and what command to run for the task
#
# To define the time you can provide concrete values for
# minute (m), hour (h), day of month (dom), month (mon),
# and day of week (dow) or use '*' in these fields (for 'any').#
# Notice that tasks will be started based on the cron's system
# daemon's notion of time and timezones.
#
# Output of the crontab jobs (including errors) is sent through
# email to the user the crontab file belongs to (unless redirected).
#
# For example, you can run a backup of all your user accounts
# at 5 a.m every week with:
# 0 5 * * 1 tar -zcf /var/backups/home.tgz /home/
#
# For more information see the manual pages of crontab(5) and cron(8)
#
# m h  dom mon dow   command

* * * * * php /var/www/html/app1/artisan schedule:run >> /dev/null 2>&1
* * * * * php /var/www/html/app2/artisan schedule:run >> /dev/null 2>&1

I've been trying to figure out for a while now why the scheduled tasks aren't firing in Laravel for app2 and came to the conclusion that the cron isn't firing for it. To test this, I fired:

service cron status

and it displayed (among other things) consistently (every minute) the first command was firing:

Mar 06 16:23:01 SRV-PHP7-SVR CRON[22216]: (user) CMD (php /var/www/html/app1/artisan schedule:run >> /dev/null 2>&1)

but nothing for app2. I then did a test by removing the following line:

* * * * * php /var/www/html/app1/artisan schedule:run >> /dev/null 2>&1

from the crontab and then when I ran service cron status it showed:

Mar 06 16:16:01 SRV-PHP7-SVR CRON[22033]: (user) CMD (php /var/www/html/app2/artisan schedule:run >> /dev/null 2>&1)

How I can run the same minute cron for both the application without it overlapping?

via Chebli Mohamed