Gagra is generally safe even at night time. The city is quite secure with a low crime rate. However, as always but particularly when traveling solo, it's crucial to remain attentive to your surroundings. Predominantly, locals are friendly and welcoming, but avoid poorly lit areas or places that seem deserted. It's always better to stick to well-lit, crowded places, especially when you're alone. Also, it's recommended to learn a few phrases in the local language just in case you need to ask for help.