SAN ANTONIO – An apparent night of romance turned to violence when a man stabbed a 47-year-old woman he met on a dating app early Tuesday on the city's Northwest Side, police said.

According to a police report, the woman picked up the man -- who she had met two days before on the Plenty of Fish dating app -- and brought him to her apartment in the 400 block of Vance Jackson Road to spend the night.

At some point, the two got into an argument and the man grabbed a butcher knife from the kitchen and stabbed her in the back, the report said.

The victim's son heard her scream and saw the knife impaled in his mother's back between her shoulder blades, the report said. 

"Your Mom stabbed herself in the back!" the man told the son, the report said.

The woman's son pushed the man out of the apartment, and the man hasn't been seen since.

The victim was taken to University Hospital, where she told police officers the man had stabbed her and his profile was on her cellphone.

The knife was retrieved as evidence after surgery, the report said. 

The woman was last listed in good condition, the report said.

San Antonio police officials said people need to be careful about online dating -- especially during the first face-to-face meetings. Here are some tips from SAPD.

1. Get to know the other person.
Keep your communications on the platform and really get to know users online/using the app before meeting them in person. Bad actors often push people to communicate off the platform immediately. 

It's up to you to research and do your due diligence. 

2. Always meet and stay in public.
Meet for the first few times in a populated, public place - never in a private or remote location and never at your date's home or apartment. If your date pressures you, end the date and leave at once. 

3. Tell your friends and family members of your plans.
Inform a friend or family member of your plans and when and where you're going. Make sure you have your cell phone charged and with you at all times. 

4. Transport yourself to and from the meeting.
You need to be independent and in control of your own transportation, especially in case things don't work out. 

5. Stay sober.
Consumption of alcohol and/or other drugs can impair your judgment and potentially put you in danger. It's important to keep a clear mind and avoid anything that might place you at risk. Be aware that bad actors might try to take advantage of you by altering your beverage(s) with synthetic substances.