How not consider a specific value in a data stream?

Question

I tried to program a server (UDP Socket) to allow a data exchange between my PC and a sensor in testing machine. I receive from a sensor continually a data like this:

0.00;0.966458;4.75;0.000160
0.00;0.976958;4.75;0.000160
S reached (1)    
0.00;0.986958;4.75;0.000160    
0.00;1.001051;-2.25;0.000160

Each second I receive from a sensor several lines of "strings". My goal: as soon the second value in a line 0.00;0.966458;4.75;0.000160 is >= than specific value (e.g. 0.98) the server shall send the next command to machine.

Part of my code:

while True:
    data1, address = socket.recvfrom(1024)
    data1 = data1.decode("utf-8").strip()
    s = round(float(data1[5:13]), 2)
    print(s)

    if s >= float(0.98):
        print("hello") # here shall be the next command for machine
        break

The problem is, that machine send me some times

S reached (1)  

This cannot be converted to float. I get error mesage:

ValueError: could not convert string to float: 'ched (1)'

Is it possible to skip or not consider the line S reached (1) in a loop , and just check the next one?