title: R crashes when fitting truncated normal distribution
body: <p>The following code crashes every time I run it and on two different R versions. I bet I'm doing something wrong (maybe I inadvertently drive the optimization somewhere it can't go?) but I fail to see what. My idea here is to help the MLE the most I can by providing almost good <code>a</code>, <code>mean</code> and <code>sd</code>. As you can see I generate a data sample quite close to the fitting parameters (on purpose).</p>
  <pre><code>library(truncnorm)
  library(fitdistrplus)
  fitdist(rtruncnorm(100, a=8, mean=10, sd=1),
          &quot;truncnorm&quot;, fix.arg=list(a=8),
          start = list(mean = 10+0.5, sd = 1+0.1))
  </code></pre>
  <p>This code crashes (so it quits the R session) with error : &quot;Process R floating point exception at Wed Apr 27 18:03:47 2022&quot; on Linux and &quot;session aborted&quot; on RStudio on Windows. I tried several start parameters for <code>mean</code> and <code>sd</code> but the result is the same: crash. I use R version 4.0.3.</p>