std::min_element returning unexpected result

I want to find the minimum of a vector:

#include <algorithm>
#include <iostream>
#include <vector>

using namespace std;

int main () {
    vector<double> v{2, 0, 4};
    double minT = *std::min_element(v.begin(), v.end(),
                                    [](double i1, double i2) {
                                        std::cout << "Comparing: " << i1 << "  " << i2 << "   " << ((i1 < i2)? i1:i2) << "    " << '\n';
                                        return (i1 < i2)? i1:i2;
                                    });
    cout << "Minimum is: " << minT << '\n';
}

But the output of this piece of code is:

Comparing: 0  2   0    
Comparing: 4  2   2    
Minimum is: 4

What am I doing wrong? Is there any undefined behaviour there?

NOTE: I know I do not need the lambda function. Removing it returns the expected result (0), but my goal is to have a personalized min function which does not consider zeros.