Getting Exception thrown at 0x00007FFA8C9E33CD (ucrtbased.dll) when trying to access a PopupModal in ImGui

This is the block of code

        {
            static float f = 0.0f;
            static int counter = 0;

            ImGui::Begin("Hello, welcome to Life Simulator!");
            if (ImGui::Button("Dealership"))
                ImGui::OpenPopup("Dealership");

            // Always center this window when appearing
            ImVec2 center = ImGui::GetMainViewport()->GetCenter();

            ImGui::SetNextWindowPos(center, ImGuiCond_Appearing, ImVec2(0.5f, 0.5f));

            if (ImGui::BeginPopupModal("Dealership", NULL, ImGuiWindowFlags_AlwaysAutoResize))
            {
                ImGui::Text("Welcome to Rob's Dealership");
                ImGui::Separator();

                ImGui::PushStyleVar(ImGuiStyleVar_FramePadding, ImVec2(0, 0));
                ImGui::Text("These are the vehicles in store");
                ImGui::PopStyleVar();
                ImGui::Text("Model: %s, Color: %s, Price: %s", Slot1.Model, Slot1.Color, Slot1.Price);

                if (ImGui::Button("Leave", ImVec2(120, 0))) { ImGui::CloseCurrentPopup(); }
                ImGui::EndPopup();
            }
            ImGui::End();
        }

After I click on the Dealership button the program stops and I get

Exception thrown at 0x00007FFA8C9E33CD (ucrtbased.dll) in ConsoleApplication2.exe: 0xC0000005: Access violation reading location 0x0000000000002EE0.

I tried moving where ImGui::BeginPopupModal is, but when I clicked on the button nothing would happen at all

Edit: I've narrowed it down to ImGui::Text("Model: %s, Color: %s, Price: %s", Slot1.Model, Slot1.Color, Slot1.Price); The Model and Price variables are std::strings

Edit 2: I did get it figured out by changing the Model and Color variables to const char* and changing ImGui::Text("Model: %s, Color: %s, Price: %s", Slot1.Model, Slot1.Color, Slot1.Price); to ImGui::Text("Model: %s, Color: %s, Price: %i", Slot1.Model, Slot1.Color, Slot1.Price);