Bollinger bands squeeze based EA - MQL5

I’m building an EA based on the Bollinger bands squeeze strategy: The distance between the upper and lower Bollinger bands is called the bandwidth. A very short bandwidth indicates an imminent price breakout  in either direction. To find if the current bandwidth is “very short”, we compare it to the lowest bandwidth of the last n periods.

For example, let’s say n=10, if the bandwidth of the last completed bar (bandwidth[1])  is shorter than the smallest bandwidth of the last 10 periods (bandwidth[2-11]) then a Squeeze has formed and we enter in “trading mode”, that is, we will look for a close above or below the bands to enter a position.

I’m having issues with finding the smallest bandwidth of the last n periods. I have tried differente ways of doing so and the EA either stops abruptly or does nothing. I would like someone to look at my code and point the right way to calculate the lowest bandwidth of the last n periods.

Background information on the Bollinger bands squeeze strategy can be found from Mr. Bollinger himself on his website: http://www.bbforex.com/methods/?m=1

EDITED: To include the current code file.